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LIST OF HISTORICAL PLAGUES

Jonesie

Well-known member
List of historical plagues

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Use of the term plague

The term plague is usually defined as a pestilence, an epidemic disease causing a high rate of mortality. Plagues of disease are a major factor in the development of human civilization, impacting and altering the course of wars, migrations, population growth, urbanization, and cultural development. The term carries such extreme connotations that it is often synonymous with a "calamity", projecting an image of a disastrous evil or affliction.

During the overwhelming disease outbreaks of the Middle Ages, the single word "plague" was associated with a disease which some now identify as bubonic plague, the virulent contagious febrile disease caused by the bacillus Yersinia pestis. In the Middle Ages, plague was often known as the Black Death. According to some theories, bubonic plague, which is sometimes spread by fleas from rodents, including rats and some species of mice, to humans, may have reached epidemic and even pandemic proportions during the history of Asia and Europe, disrupting civilizations and altering the course of human affairs. However, recent investigations have revealed significant problems with this theory, including the fact that the incubation period of bubonic plague (4-5 days) is vastly different from the incubation period of the Black Death (37 days), the fatality rate is highly dissimilar (below 10% for bubonic plague, over 40% for the Black Death), and the fact that the Black Death occurred in places like Iceland, which had no rats until hundreds of years later. An alternate hypothesis is therefore that the Black Death was caused by a viral hemorrhagic disease, perhaps similar to Ebola.

Whatever the cause, disease brought terror and panic in crowded cities, decimating populations like a visitation of the gods. In the New World, first contact with Europeans brought similar overwhelming pandemics of measles and smallpox, though not of bubonic plague, that led to a drastic drop in population and the collapse of American cultures.


Major plague outbreaks

Famous outbreaks of plagues examined in individual entries:

Great Plague of Athens (430?427 BC)
causal agent: bubonic plague/smallpox/measles/typhus/anthrax/typhoid?

Antonine Plague (165?180)
causal agent: smallpox/measles?

Plague of Cyprian (250)
causal agent: smallpox/measles?

Plague of Justinian (541?542)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Plague of Constantinople (747?748)

The "Black Death" of 1347?51:

Great Plague of England (1348?1350)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Ireland (1348?1351)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Scotland (1348?1350)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Russia (1349?1353)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Iceland (1402?1404)
causal agent: viral hemorrhagic plague (not bubonic plague, as there were no rats in Iceland)

London Plague (1592?1594)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Italian Plague of 1629-1631 or Great Plague of Milan (1629?1631)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Seville (1649)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of London (1664?1665)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Vienna (1679?1680s)
causal agent: viral hemorrhagic plague or possibly bubonic plague

Great Plague of Marseille (1720?1722)
causal agent: possibly bubonic plague?

Plague Riot in Moscow (1771)
causal agent: possibly bubonic plague?

The Third Pandemic, originated in China (1855?1950s)
causal agent: bubonic plague?

http://en.wikipedia.org/wiki/Great_Plague
 
Re: LIST OF HISTORICAL PLAGUES

CHAPTER 5
THE MICROBIOLOGY OF HISTORY AND THE HISTORY OF MICROBIOLOGY​

Most history examines the political, military, sociological or economic events that have defined our past. But throughout our existence, unseen and often unappreciated microscopic participants have often helped to shape the human experience. In most of history’s important wars, for example, far more combatants and civilians have been killed by microorganisms than by bullets and bombs. In the American Civil war, just to name one, 93,443 Union soldiers died on the battlefield or of battle-inflected wounds. Disease was responsible for 186,216 Union army deaths, many due to typhoid. Similar statistics are not available for the Confederate army, but the death toll due to typhoid was believed to be even higher for the South. It was not until the twentieth century that mankind’s ability to kill in battle exceeded that of microbes. Infectious disease may have hastened the fall of Rome, the abandonment of feudalism in medieval England and contributed to Napoleon’s decision to sell French territories in North America to the United States.

In this chapter we will explore these and other examples of how microbes have altered the course of history. This is not to suggest that microorganisms have played the only or even the principle role in determining past events. To do so would clearly be absurd. However in many cases, our understanding of why certain important historical events occurred as they did can be improved by also considering them from the perspective of the microbiologist. Furthermore, by thinking about the manner in which history has been altered by microorganisms, we gain added insight into the biology of the organisms themselves.

After considering some of the ways in which microorganisms have altered the course of human history, we will turn our attention to the history of microbiology itself. The study of microorganisms has a rich and vital history, and we will focus on some of the important people and key discoveries that have led to the development of modern microbiology.

If Microbiologists Wrote History​

Case: The Spanish Conquest of Mexico

In the early 1500’s the Native American population in what is now Mexico is estimated to have been between 25 and 30 million people. Much of the land was under the control of the Aztec Empire. The Aztecs were fierce, warlike people, who nevertheless developed a sophisticated society, comparable to the great civilizations of ancient Europe and Asia. In 1519, Hernando Cortez landed on the Yucatan Peninsula with about 600 soldiers. Captivated by stories of the Aztec’s wealth and the splendor of their capital of Tenochtitlan (now Mexico City), he began to march inland, intent on conquest. Cortez exploited several advantages as he moved toward the capital. He obtained the support of many other native tribes by promising to relieve them of Aztec domination. The unusual appearance of the white bearded soldiers in their metal armor convinced many that the Spanish must be Gods and therefore invincible.
The Spanish also had horses and weapons such as muskets and cannons that were unknown in the Americas. Yet after initially appeasing the Spanish, the Aztecs fought savagely once the Spanish had occupied Tenochtitlan and their intent became obvious. The Aztecs expelled the invaders from the capital, and might easily have destroyed their remaining forces. But the native defenders failed to give chase. During this time, a smallpox epidemic raged among the Aztecs, severely crippling their ability to continue the fight. The Spanish eventually regrouped and conquered the Aztecs, subjugating the once proud people and forcing them into servitude. The death toil among the native peoples was staggering. Within 50 years, the native population in Mexico had shrunk to 3 million, and by 1600 it was fewer than 2 million, a mere 5-8% of the pre-conquest population. Many of these deaths were due to smallpox.

1. Why did smallpox exact such a heavy toll on Native Americans, but not the Spanish?
2. Why were the Spanish aided by smallpox, but not decimated by “American diseases” to which the native peoples were resistant?
3. How was the conquest of the New World different than the European experience in Africa?
4. Are there other examples of diseases influencing the outcome of armed conflict? What characteristics do the involved microorganisms have in common?

As you have no doubt guessed, the answer to the first part of question 4 above is emphatically “yes”. Unseen microbial allies and enemies have turned the tide in more of their share of mankind’s battles. Before we further explore the role of smallpox in the conquest of the Americas, let’s go back to even earlier times, and attempt to understand the part played by infectious organisms in some of history’s seminal events.

Disease in Ancient Greece and Rome

The Peloponnesian War

Following the defeat of the invading Persians in the epic naval battle of Salamis in 480 B.C. the power of Athens was at its height. Thus began the “Greek Golden Age”, an unparalleled period of creativity and advances in philosophy, architecture and the arts.
This period of extraordinary enlightenment, however, was all too brief. In 431 B.C. war broke out between Athens and the rival Greek city state of Sparta. The conflict, known as the Peloponnesian War, initially was a standoff. Sparta had a strong army, but no navy. Athens, with a powerful navy, but a weak army fought a defensive war on land and an offensive war at sea. Although the Athenians were crowded behind their city fortifications, they might have lasted indefinitely, bringing in supplies as needed by ship. Crowded conditions, however, increase the likelihood of epidemic disease, and in 430 B.C. that is exactly what happened. A plague, perhaps arriving in Athens via a trading vessel from Egypt broke out, killing between one and two thirds of the city’s population.

The nature of this disease remains unknown. The historian Thucydides describes the illness as striking rich and poor alike. The disease was characterized by rapid onset, high fever, and extreme thirst. Eventually, pustules formed on the skin of victims. Thucydides noted that those who recovered from the illness were those best suited to care for the sick, because they somehow became resistant to a second infection following their recovery. This is one of the first descriptions of acquired immunity, a topic we will explore more fully in chapter 10.

Many experts feel that the disease described by Thucydides was an unusually virulent form of scarlet fever, caused by the gram positive cocci Streptococcus pyogenes. Other authorities have implicated smallpox, measles, or bubonic plague. It remains possible that the plague of Athens was caused by a disease that no longer exists, or by one that has changed so much that it is now unrecognizable. Regardless of the cause, the plague undoubtedly contributed to the eventual defeat of Athens, and the end of the Athenian Golden Age. With the loss of so much of its population, Athens was never able to strike a decisive blow. The war dragged on for 27 years, before Sparta ultimately prevailed in 404 B.C.

The Fall of the Roman Empire

In the late second century, the Roman Empire stretched from the British Isles to North Africa and from Portugal to Arabia (Fig. 5.3b). But over the next two centuries Rome began a long and slow disintegration, culminating with the sack of Rome by the Visigoths in 410 A.D. The fall of Rome is arguably the most important event in the history of Western civilization. Historians have debated for years why Rome collapsed, and the reasons are undoubtedly complex. Certainly, centuries of pressure from tribes such as the Goths, Vandals and Franks along the northern frontier were important. Often, the general decadence of the wealthy and luxury-seeking Romans is cited as a key reason for the decline of the empire and traditional Roman fighting spirit. Indeed, by the 4th century A.D., Germanic tribesman rather than Roman citizens formed the bulk of the Roman army.

Why did the Romans allow the security of their empire to fall increasingly into the hands of non-Romans? While “moral decay” may have been a factor, it is also probable that a decline in Rome’s population played at least a part in the changing makeup of the Roman legions. Certainly some of the reasons for the population decline were disease-related. Starting in the 1st century B.C. epidemic malaria became a regular part of Roman life. The problem was especially bad in the agricultural districts surrounding the capital and many cultivated areas were actually abandoned.

Other epidemics may have contributed to Rome’s slow decline. These included the “Great Plague of Cyprian” that began in 250 A.D. The cause of this plague is unknown. Cyprian, the Christian bishop of Carthage described symptoms such as explosive diarrhea, high fever, and gangrene of the hands and feet. The plague lasted at least sixteen years, with higher mortality than any previous epidemic known. The disease moved quickly across the empire, and was said to be spread not only by contact with infected individuals, but via any articles used by the sick including clothing. The plague ebbed each summer, with fresh outbreaks each fall. Over half of those who contracted the mystery illness were killed.

By late the 4th century A.D. the Roman Empire had been divided into Western and Eastern Empires. When the Visigoths entered Rome early in the Fifth century, The Eastern Empire, with its capital at Byzantium (later Constantinople and now Istanbul), was all that remained.

Those in the Eastern Empire dreamed of recapturing the west and this dream almost became reality under the leadership of the Emperor Justinian. With the goal of resurrecting the grandeur of a united empire, Justinian attacked the west in 532 A.D. He recaptured Sicily, as well as portions of the Italian Peninsula including the capital at Rome. After retaking parts of Spain, he made bold plans to lead his forces back into Gaul and even Britain.

In 540 A.D. disaster struck. Bubonic plague broke out in North Africa and quickly spread to the rest of the known world, reaching Byzantium in 542. The outbreak, now known as the “Justinian Plague” may have been the worst epidemic that has ever assaulted mankind. Up to 10,000 people a day died in the Eastern Empire. So high was the death rate that graves could not be dug in time. Whole buildings were filled with corpses and set ablaze. Ships were loaded with the dead, rowed out to sea and cast adrift.

Descriptions of the disease allow its clear diagnosis. Victims experienced high fever, combined with swollen glands or “bubos” in the armpits and groin. Often the bubos ruptured, resulting in gangrenous lesions and causing excruciating pain. Death typically followed within a week. All ages were vulnerable, but men were seemingly at higher risk than women. The plague would strike an area, and then recede, only to return again. No town or village was spared. Many cities were wiped out or abandoned, as were agricultural areas. The entire empire descended into panic and confusion. It was not until about 590 A.D. that the epidemic ended.

We can never know to what extent the plague quashed Justinian’s ambitions and led to the ultimate demise of the Eastern Roman Empire. But it seems clear that at the very least, these events were hastened by this disease, and that bubonic plague assisted in irrevocably changing the history of the Western world.

The Black Death

In 1346 the Tatars from central Asia attacked a small Italian trading colony on the shores of the Black sea. During the siege, bubonic plague broke out among the attackers. In an early example of biological warfare, bodies of dead plague victims were catapulted over the walls into the city. Plague soon appeared among the Italians, some of whom managed to escape their beleaguered colony via ship. A few days after their ship arrived in the Italian port of Genoa, the first cases of plague in the city were reported.

Thus began the notorious bubonic plague epidemic known as the “Black Death”. While the Italian merchants had brought the disease to Europe, the Tatars, in whom the epidemic began, spread plague north into Russia, and east into India and China. The devastation caused by this world-wide epidemic or pandemic is hard to comprehend. In Europe alone, it is estimated that 24 million people were killed, representing 25% of the total population of Europe at the time.

A mortality rate of such stupendous proportions had major social and political ramifications. Deaths from plague caused such a manpower shortage that England and France, then fighting the “Hundred Years War”, signed a truce in 1349, putting the war on hold until 1355. In Siena, local Catholic authorities were hoping to attract the papacy to the city by tripling the size of the Siena’s cathedral. With the outbreak of bubonic plague, these plans were permanently shelved. From Norway, ships carried the infection to colonies in Greenland that had been founded by Erik the Red. Plague weakened the colonists to such an extent that they could not withstand Eskimo attacks. Those colonists that were not killed either by attackers or plague abandoned the colony. Greenland was then forgotten for over 200 years until it was “rediscovered” in 1585. Because the Viking colonists in Greenland were known to have visited the Canadian coast, the extinction of the Greenland settlements perhaps permanently altered the history of North America.

Nowhere was the impact on the social fabric of society greater than it was in England.
The epidemic first spread to the British Isles in August, 1348. It reached London in November of that year, and spread to Ireland in 1349. By 1350 it had arrived in Scotland. At the time, England was still largely an agricultural society, governed by a feudal system of indentured servitude. Prior to the outbreak of plague, England’s growing population resulted in a regular supply of cheap labor. Land holders were able to keep wages low, insuring that the typical laborer would never be able to pay off his debt, and obtain land of his own. But with bubonic plague came a severe manpower shortage. Now, for perhaps the first time, laborers had leverage, and could demand higher wages. As they gained unprecedented economic independence, the feudal system was dealt a lethal blow. Within 150 years it had entirely disappeared.

The Conquest of the Americas

Rarely in the history of humanity is the role of infectious organisms more clear than in the conquest of the Americas. Cortez was not the only conquistador who was assisted by lethal pathogens. Once established in Mexico, smallpox spread rapidly to South America. Millions of Incas in Peru, including the reigning emperor were killed. When Francisco Pizarro arrived with a small band of Spanish soldiers, the Inca Empire was in political and social upheaval. Pizarro was thus able to usurp control without significant military opposition.

Smallpox was not the only disease that Europeans unwittingly introduced into the new world. Measles, influenza and malaria were also absent in the Americas before Columbus. The reasons why Native Americans, unlike the Europeans, were so susceptible to these diseases are straightforward. All of these imported diseases first appeared in the old world. Europeans already had a long history, stretching back perhaps thousands of years, interacting with the organisms causing these diseases. As we will explore more fully in later chapters, all mammals including humans, eventually evolve some measure of resistance to regularly encountered diseases. Because viruses such as smallpox were absent in the new world before the arrival of the Spanish, no such opportunity was afforded to the Native Americans. Therefore, although the Spanish could still contract and transmit diseases such as smallpox, they were far less likely than the native populace to develop serious illness. The Aztecs watched as their own people died in large numbers while the Spanish remained relatively disease-free. This convinced many that the ailment was evidence of the Spanish Christian God’s superiority to their own deities, further reducing their resolve to fight.

But this raises an interesting question: Why were the Spanish not decimated by “American diseases” to which the native population was resistant? The conquest of the Americas occurred in a breathtakingly short period of time, in large part because there were few such diseases. Why not? This was certainly not the case when Europeans attempted to colonize Africa. A plethora of indigenous African maladies lay in ambush to weigh lay potential invaders. Consequently, while the Spanish conquest of Mexico and Peru was completed in a few short years, it was not until the 20th century that the European colonization of Africa was complete.

To answer these questions, it is necessary to consider some of the qualities shared by diseases such as smallpox, measles, and influenza. First, all of these diseases are acute in nature. Once a host is infected, the pathogen replicates rapidly, and symptoms of disease appear in quickly. Furthermore, there are only two possible outcomes of this host/pathogen interaction. Within a short period of time the host either recovers or dies.
If the host recovers, he or she will typically be immune to the same pathogen, at least for a period of time. We will explore how such “immunological memory” is developed in chapter 10.

Because agents of acute disease either rapidly kill their host or are themselves destroyed, they must be transmitted to new hosts quickly and efficiently if they are to survive. Smallpox virus, for instance is transmitted through the air. A single cough or sneeze by an infected individual can infect many other potentially susceptible hosts. The situation is different for chronic diseases (Fig. 5.6). These are conditions that last indefinitely, sometimes for years or decades. The host immune system is able to control but not eliminate the disease-causing microbe. For a pathogen such as this, there is far less need for rapid transmission. It can survive in its current host indefinitely, and has a relatively long period of time in which to reach new hosts.

Acute diseases need large populations of potential hosts. Consequently, they are often called “crowd diseases”. Remember that each new host either recovers quickly and is subsequently immune, or is killed. The pathogen therefore needs a large supply of susceptible hosts to persist. When an acute disease is introduced into a small isolated population, it quickly “uses up” all potential hosts and then dies out itself. Studies have shown, for instance, that measles virus will die out in populations under one million. When measles was accidentally introduced into the Faeroe Islands, in 1781 a severe epidemic broke out. The Faeroes are an isolated group of islands in the North Atlantic, and after the virus spread through the entire population it went extinct. The islands then remained measles-free until an infected individual from Denmark brought the virus back to the islands by ship in 1846. In large populations, new hosts in the form of newborns, immigrants, or people in whom immunity has worn off, insure a constant supply of susceptible individuals, allowing the virus to persist indefinitely.

Finally, molecular analysis of pathogens causing acute disease has revealed that many of them are most closely related to pathogens causing similar “crowd disease” in animals. Smallpox virus and measles virus, for instance, are most closely related to viruses causing acute diseases in cattle. Most authorities believe that in the 8,000 years that cattle have been domesticated in the old world, these animal viruses made the jump from cattle to humans. Other acute disease agents are similarly related to viruses found in domestic animals such as pigs and chickens that had been raised in large numbers for thousands of years in the old world.

But in the new world there was no similar long standing tradition of animal husbandry. The only animals that had been domesticated prior to European contact were the dog, the turkey in Mexico, and the guinea pig, Muscovy duck and llama in South America. Thus, the opportunities for animal-to-human transmission were greatly reduced. This is not to say that the Americas were disease-free. But the relatively infrequent or even non-existent contact between Native Americans and large herds of animals resulted in far fewer human acute illnesses.

In this manner, Cortez and other conquerors were aided by a one-sided exchange of deadly microbes. Perhaps a dozen or more major infectious diseases were introduced into the New World by Europeans. With the possible exception of syphilis, the origins of which are still debated, no similar lethal disease was transferred from the New World back to Europe.

The rapidity of America’s conquest stands in stark contrast to the European experience in Africa. In spite of numerous efforts, attempts to colonize or even to explore Africa through the 18th and 19th often met with dismal failure. In 1816, for instance, the exploration of the Congo River by Captain James Tucky was cut short when almost all members of his party were struck by “an intense remittent fever and black vomit in some cases”. In 1841, Captain H.D. Trotter set out to explore the Niger River with 145 Europeans and 133 Africans. After traveling 100 miles upstream, severe fever broke out. Among the Europeans, 130 became seriously ill, and 50 died. All of the Africans remained healthy.

Native Africans did not have large herds of domestic animals, but unlike the situation in Mexico and South America, there were enormous herds of wild grazing animals. These animals served as reservoirs for many agents of disease to which the animals themselves as well as native Africans were relatively unaffected. Sleeping sickness, yellow fever and other diseases took a heavy toll on both Europeans and their animals. Until the cause and prevention of such ailments was understood, little progress in the colonization of Africa was possible. Indeed, the tse tse fly, which carries the protozoans causing sleeping sickness, has been called “Africa’s greatest game warden”. Until it became possible to control these flies, large segments of Africa’s most fertile lands were “off limits” for raising domestic livestock, because these non-African animals were so susceptible to sleeping sickness.


Napoleon’s Microbial Waterloo

Napoleon is certainly one of the major historical figures of the 19th century. Decisions made by the French Emperor doubled the size of the United States and changed the political landscape of Europe. In at least two of his most monumental endeavors, disease looms large.

At the end of the 18th century, France controlled an enormous tract of land in North America, stretching from the Mississippi River to the Rocky Mountains, and from the Gulf of Mexico to Canada (Fig. 5.8). The French also possessed several Caribbean islands, including Haiti, where large sugar plantations were established. By this time it was recognized that Africans were far more resistant to yellow fever than either Native Americans or Europeans. Accordingly, large numbers of African slaves were brought into Haiti to work on the plantations.

Early in 1802 a slave revolt erupted in Haiti. To put down the revolt, Napoleon sent 27,000 troops to the island. But it was not long before most of these soldiers were laid low by yellow fever. Well over half eventually died. These heavy losses influenced Napoleon’s decision not to risk even more French soldiers in defense of French territory in North America. Napoleon reasoned that these troops could be better used extending his empire in Europe. Such logic was an important part of the reason Napoleon sold the vast Louisiana Territory to the United States in 1803.

In the early summer of 1812, Napoleon turned his attention east and invaded Russia. Initially his plans went well, but as his army of over 400,000 men crossed through Poland, typhus broke out among his troops.

Typhus is caused by the bacterium Rickettsia prowazekii. It is transmitted by body lice (Fig. 5.9). Typhus most often strikes when people are crowed together under unsanitary conditions. Failure to bath or to wash clothing facilitates transmission by lice. History is filled with examples of armies being plagued with typhus because soldiers often find themselves in situations that are ideal for typhus transmission.

By the time Napoleon’s army reached Moscow on September 14, only 90,000 of his troops remained. Typhus, combined with starvation of the ill-equipped soldiers accounted for most of the deaths. Ultimately, Napoleon was forced to withdraw from Russia, defeated by typhus, hunger and the Russian winter. By the end of the year approximately 20,000 French troops staggered into Vilnius on the Baltic Sea. Although reinforcements arrived, the spirit of the French army had been destroyed. Fewer than 1,000 of the once mighty army were ever again fit for duty. Napoleon’s dream of conquering Russia had ended for good.

http://biology.unm.edu/Biol490/HistoryChapter.doc
 
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Re: LIST OF HISTORICAL PLAGUES

Plague in the Ancient World:
A Study from Thucydides to Justinian


by Christine A. Smith

Throughout history, humans have been faced with disastrous catastrophes which must be endured in order to survive. One of the most incomprehensible disasters for humanity has been the plague. This term in Greek can refer to any kind of sickness; in Latin, the terms are plaga and pestis. In antiquity, two of the most devastating plagues were the Athenian plague of 430 B.C. and the Justinianic plague of 542 A.D. This paper will discuss these plagues, the manner in which they spread, and their consequences for the survivors. Also, the ways in which ancient writers wrote about these disasters will be discussed, with special reference to the role of the gods. Much of what is conventionally believed about these plagues comes from comparisons with the Black Death, a visitation of bubonic plague during the fourteenth century A.D. Although the sources for the Athenian and Justinianic plagues are insufficient, there is some question as to the validity of this analogy as an historical source.

The Athenian plague occurred in 430-26 B.C. during the Peloponnesian War, which was fought between Athens and Sparta from 431 to 404. Because of overcrowded wartime conditions in the city, the plague spread quickly, killing tens of thousands. Included among its victims was Pericles, the former leader of Athens. The only surviving source for the Athenian plague is the first-hand account of Thucydides in his History of the Peloponnesian War. Thucydides, who lived from c. 460 to c. 400, was an Athenian general and political critic.

In his History of the Peloponnesian War, Thucydides employed a carefully developed structure to investigate the meaning and causes of historical events. His writing, which evolved from Sophistic thought, reflected a constant conscious analysis of grammar and rhetoric. History, according to Thucydides, was a process of human nature; and as such, it was highly influenced by mass movements. He, therefore, stressed physical reality, and did not allow for the active intervention by the gods. This is most evident in his account of the Athenian plague, since plagues were traditionally attributed to the wrath of the gods, as evidenced in Herodotus, as well as in the Book of Exodus and the Iliad of Homer. Through this work, Thucydides began an historiographical tradition which would become the model for many future historians.

Having suffered from the plague himself, Thucydides presented a very systematic account of the symptoms. His aim was merely to "describe what it was like, and set down the symptoms, knowledge of which will enable it to be recognized, if it should ever break out again." The Athenian plague originated in Ethiopia, and from there spread throughout Egypt and Greece. Thucydides, however, remarked that the city of Athens suffered the greatest toll from the disease. Initial symptoms of the plague included headaches, conjunctivitis, a rash which covered the body, and fever. The victims then coughed up blood, and suffered from extremely painful stomach cramping, followed by vomiting and attacks of "ineffectual retching." Many people also experienced insomnia and restlessness. Thucydides also related that victims had such an unquenchable thirst that it drove them to throw themselves into the wells. Infected individuals generally died by the seventh or eighth day. If anyone managed to survive this long however, s/he was then stricken by uncontrollable diarrhea, which frequently caused death. Those who survived this stage might suffer from partial paralysis, amnesia, or blindness for the rest of their lives. Fortunately, infection of the plague provided immunity; that is, few caught the disease twice, and if this occurred, the second attack was never fatal.

Thucydides? description also included the social consequences of the Athenian plague, which he conceived within the context of the war. Doctors and other caregivers frequently caught the disease, and died with those whom they had been attempting to heal. Spartans besieging the city, however, were not affected by the disease spreading through Athens. The despair caused by the plague within the city led the people to be indifferent to the laws of men and gods, and many cast themselves into self-indulgence. In particular, Thucydides mentioned that no one observed the customary funerary rites. With the fall of civic duty and religion, superstition reigned, especially in the recollection of old oracles. During the first century B.C., Lucretius would use this section of Thucydides? account of the Athenian plague to support the doctrines of Epicurus. To him, the plague illustrated not only human vulnerability, but also the futility of religion and belief in the gods.

Although many disastrous epidemics probably occurred between the Athenian and Justinianic plagues, few sources detailing these plagues have survived. Unfortunately, the accounts which do exist, are meager; and because of this, the microbial origins of the described plagues cannot be diagnosed. These sources frequently copy the literary style of Thucydides; however, they do not generally adhere to his belief regarding the noninvolvement of the gods.

One such disease, known as the Antonine plague, occurred during the reign of Marcus Aurelius (161-180 A.D.). It was brought back by soldiers returning from Seleucia, and before it abated, it had affected Asia Minor, Egypt, Greece, and Italy. The plague destroyed as much as one-third of the population in some areas, and decimated the Roman army. In 180, Marcus Aurelius caught some type of infection and died in his army camp. There has been some speculation that this infection was the plague. Another plague occurred during the reigns of Decius (249-251 A.D.) and Gallus (251-253 A.D.). This pestilence broke out in Egypt in 251, and from there infected the entire empire. Its mortality rate severely depleted the ranks of the army, and caused massive labor shortages. The plague was still raging in 270, when it caused the death of the emperor Claudius Gothicus (268-270).

After the third century, there is not another well-documented plague until the Justinianic plague in the mid-sixth century. This plague originated in 541-2 either in Ethiopia, moving through Egypt, or in the Central Asian steppes, where it then traveled along the caravan trading routes. From one of these two locations, the pestilence quickly spread throughout the Roman world and beyond. Like the Black Death which followed it in 1348, the Justinianic plague generally followed trading routes providing an "exchange of infections as well as of goods," and therefore, was especially brutal to coastal cities. The movement of troops during the campaigns of Justinian provided another source for the plague expansion. These two factors, trade and military movement, spread the disease from Asia Minor to Africa and Italy, and also to Western Europe.

Although many writers documented this period, there are three main sources for the Justinianic plague: John of Ephesus, Evagrius Scholasticus, and especially Procopius. John of Ephesus wrote his Historia Ecclesiastica during this period, while travelling around the empire. This work unfortunately survives only in fragments. Evagrius, a lawyer and honorary prefect living in the city of Antioch, wrote his Historia Ecclesiastica covering the years 431-594 at the end of the sixth century. His is the most personal of the accounts, having contracted the disease himself in 542 while still young. Although he eventually recovered, later recurrences of the plague would deprive him of his first wife, several children, a grandchild, and many servants of the family. Another source for the Justinianic plague is the Historia of Agathias. A lawyer and poet, he continued the history of Procopius. His account of the Justinianic plague is of its second appearance in Constantinople in 558. A further account is the Chronicle of John Malalas; however, this work may have copied Procopius.

Although all of these sources give scholars important information about the plague, the History of the Wars, published in 550 by Procopius, gives the most systematic account of the symptoms and immediate consequences of the disease. Raised in Caesarea, Procopius became the legal secretary of the general Belisarius, and traveled with him throughout Justinian?s reconquest campaigns in Italy, the Balkans, and in Africa. In 542, he witnessed the plague in Constantinople.

Procopius? primary literary model was Thucydides, a writer whom he, as well as every other writer in the classical world, consciously emulated. During the reign of Marcus Aurelius, Lucian of Samosata composed a work entitled How to Write History. Here, Lucian stated that history was distinct from rhetoric, with the goal of writing the truth. He also included two criteria for an historian. First, the historian must have the natural gift of being able to understand public affairs. The second criteria was that the historian must be able to write. This, however, was not a natural gift. It was the result of practice and hard work, and a desire to imitate the ancient writers.

There are many reasons to state that Procopius consciously imitated the work of Thucydides. In the preface to his History of the Wars, Procopius claimed that he "considered cleverness suitable for rhetoric, the telling of myth for poetry, but for history, truth." This introduction mirrors that of Thucydides, a fact that Procopius would have wanted his readers to recall to give his history credibility. Procopius also wrote his works in classical Attic Greek, which had long fallen out of use in the late Roman empire. Showing reluctance to use non-Attic words, Procopius was careful to avoid borrowing from Latin. For example, when he mentions a Latin term, such as referendarii, he always prefaces the word with a "as the Romans call it" phrase. He also followed the example of Herodotus by referring, albeit inconsistently, to the Huns as the Massagetae, and the Persians as the Medes. These are examples of how Procopius emulated the classical historians, which his contemporaries would not only have admired, they also would have expected this sort of classical detachment from his work.

There are those scholars, however, who denigrate the work of Procopius as artificial because he imitated the style of the classical historians. One in particular claimed that "he [Procopius] could not even resist the opportunity which the plague?gave him to parallel his prototype?s classic account of the great plague in Athens." Statements such as these call the veracity of Procopius? account into question, suggesting that Procopius borrowed the plague description straight from the pages of the History of the Peloponnesian War. At the very least, they suggest that it is strange for Procopius to have recorded the event. After the Justinianic plague, there would not be another pandemic until the Black Death of 1348. According to Procopius in his History of the Wars, the death toll in Constantinople, when it struck in spring of 542 and raged for four months, reached 10,000 a day. Although this figure is probably exaggerated, the plague did profoundly affect the population, both in terms of the victims and the survivors, and as such, was a worthy historical topic for Procopius. After devastating the capital, the plague continued to spread throughout the entire empire, remaining endemic after 542 until the middle of the eighth century.

One reason to question those who feel that Procopius simply lifted Thucydides? account of the Athenian plague is that the two authors do not describe the same symptoms of plague. Described in detail by Procopius, John of Ephesus, and Evagrius, the Justinianic epidemic is our earliest clearly documented case of the bubonic plague. Each of these authors clearly makes reference to the formation of buboes, the tell-tale sign of bubonic plague, on the skin of victims. Thucydides, however, does not mention this symptom. The cause of the Athenian plague of 430 B.C. has not been diagnosed, but many diseases including bubonic plague have been ruled out as possibilities. The most recent theory, postulated by Olson and a growing number of other epidemiologists and classicists, regarding the cause of the Athenian plague is Ebola virus hemorrhagic fever.

The descriptions of the contagions also differed in another significant way. Thucydides noted that those who cared for the sick contracted the disease; in Constantinople, this did not regularly occur. The Athenian plague was clearly a highly contagious infectious disease. Procopius, in contrast, was describing bubonic plague, which is not directly contagious unless the patient harbors fleas, or a pneumonic element of the disease is present. Although Procopius? account followed Thucydides as a literary model, Procopius did not lift the passage straight from History of The Peloponnesian War, since it is apparent that the two authors described different symptoms.

From the description provided by Procopius, it is known that in the spring of 542, the bubonic plague reached Constantinople. Modern scholars are uncertain as to its exact origins, which may have been the plague reservoir of the modern central African countries of Kenya, Uganda, and Zaire. Still others believe the plague originated in the central Asian steppes and spread along the trade routes with the Far East, as did the Black Death of 1348. The sources contemporary with the plague also disagree over where the disease began. Procopius claimed the plague originated in Egypt near Pelusium; yet Evagrius stated that the plague began in Axum (modern day Ethiopia and eastern Sudan). Evagrius? thesis may have stemmed from a traditional prejudice of the time that diseases came from warm areas. At any rate, it certainly emerged in Egypt in 541; and following its sojourn in Constantinople, it spread throughout the empire along trade and military routes, always moving from the coastal cities to the interior provinces. The plague then surfaced in Italy in 543, and reached Syria and Palestine in the same year. From there, the contagion migrated to Persia, where it infected the Persian army and King Khusro himself, causing them to retreat east of the Tigris to the plague-free highlands of Luristan. Gregory of Tours related how St. Gall saved the people of Clermont-Ferrand in Gaul from the disease in 543, and there is some speculation that the plague may have spread to Ireland by 544. Moreover, like the Black Death, the Justinianic plague was recurrent, with the bacteria remaining endemic in the population for 250-300 years. Agathias, writing of a second outbreak in the capital in 558, related that since the first epidemic, the plague had never completely abated, rather it simply moved from one place to another.

This was the first known pandemic of bubonic plague to affect Europe. While it is less famous than the Black Death of the fourteenth century, the Justinianic plague was certainly quite as deadly. Bubonic plague is spread by the bite of fleas which find their home on rodents. The black rat carried the Black Death, and there is no reason to believe that it was not an active carrier in the sixth century. It probably was not the only carrier; the dogs which are described as dying in Constantinople almost certainly carried fleas as well. Once trading brought the plague to a city, rats found urban areas, which were overcrowded with a stationary population, conducive to their lifestyle. This assessment agrees with the evidence in that although the disease overwhelmed the Roman and Persian Empires, the nomadic Berbers of Africa and the Arab peoples were not greatly affected by the plague.

The plague itself actually occurs in three forms: bubonic, pneumonic (also called pulmonary), and septicaemic. The bubonic variety, which must exist before the other two strains can become active, will be described in detail; this form is not directly contagious unless the patient harbors fleas. Since Procopius did not state that those who cared for the sick necessarily contracted the disease, it is inferred that the bubonic form was most active in the Justinianic plague. Pneumonic plague occurs when the disease bacilli, called Yersinia pestis, invade the lungs. This variety is highly contagious from one person to another, and is spread by airborne droplets. Due to Procopius? observation that the plague was not directly contagious, and the absence of the major symptoms of pneumonic plague in the accounts, namely shallow breathing and tightness in the chest, this form was probably not very active. Septicaemia occurs when the infection enters the bloodstream, and death is swift, usually before buboes are able to form. In his account, Agathias reported some victims dying as if by an attack of apoplexy. This seems to indicate that the septicaemic form did exist during the sixth century outbreak. Bubonic plague results in death in roughly 70 percent of cases; pneumonic plague has over a 90 percent mortality rate. Although all three forms probably existed during the Justinianic plague, clearly the bubonic form predominated.

During the Justinianic plague, many victims experienced hallucinations previous to the outbreak of illness. The first symptoms of the plague followed closely behind these hallucinations though; they included fever and fatigue, neither of which seemed life-threatening. Evagrius described facial inflammation, followed by a sore throat, as an introductory symptom. Some victims also initially suffered from diarrhea. Soon however, buboes appeared in the groin area or armpits, or occasionally beside the ears. Following this symptom, the disease progressed rapidly; infected individuals usually died within two to three days. The victim generally entered a semi-conscious, lethargic state, and would not wish to eat or drink. Following this stage, the victims would be seized by madness, causing great difficulties to those who attempted to care for them. Many people died painfully when their buboes gangrened. A number of victims broke out with black blisters covering their bodies, and these individuals died swiftly. Still others died vomiting blood. Pregnant women who contracted the disease generally died through miscarriage or in childbirth, but curiously, Agathias reports that young males suffered the heaviest toll overall. There were also cases, however, in which the buboes grew to great size, and then ruptured and suppurated. If this occurred, the patient usually recovered, although s/he would often suffer afterwards from muscular tremors. Doctors, noticing this trend and not knowing how else to fight the disease, sometimes lanced the buboes of those infected to discover that carbuncles had formed. Those individuals who did survive infection usually had to live with withered thighs and tongues, classic aftereffects of the plague. One interesting fact to note here is that humans were not the only victims of this contagion. Animals, including dogs, mice, and even snakes, contracted the disease.

John of Ephesus recounted a long, somewhat rhetorical description of the plague and its effects in Palestine and within the city of Constantinople. As a Christian writer who clearly stated that the end of the world was at hand, he related many of the more grotesque elements of the epidemic. To him, the plague was a manifestation of divine wrath, and a call for repentance. His account vividly detailed scenes of havoc in which men collapsed in agony within the public quarters. The fear of being left unburied, or of falling prey to scavengers, led many individuals to wear identification tags, and when possible, to avoid leaving their homes at all. In a related description, John of Ephesus described a house which men avoided because of its foul odor. When it was finally entered, they found over twenty corpses decaying. Many men also saw apparitions and terrible visions both before and after the disease produced symptoms in them. In typical apocalyptic literature style, John of Ephesus did not see these "apparitions" and "visions" as hallucinations; to him, they offered a glimpse of the otherworldly realm. As previously mentioned, the plague spread along trade routes infecting port cities. John of Ephesus reported in his account that many ships would float aimlessly at sea, later washing up to shore with all of their crew dead from plague. He also described sailors reporting sightings of a spectral bronze ship with headless oarsmen, and monsters which appeared in the sea off the Palestine coast.

Although the emperor Justinian contracted the disease himself, he nevertheless attempted to minimize the disaster. Following the outbreak within Constantinople, Justinian commanded Theodore and the palace guard to dispose of the corpses. By this time all gravesites were beyond capacity, and the living resorted to throwing the bodies of victims out into the streets or piling them along the seashore to rot. Theodore responded to this problem by having huge pits dug across the Golden Horn in Sycae (Galata) and then hiring men to collect the dead. Although these pits reportedly held 70,000 corpses each, they soon overflowed. Bodies were then placed inside the towers in the walls, causing a stench which pervaded the entire city.

The plague left a severe impact on urban life. Although the urban poor were the first to suffer from the devastating effects, the pestilence soon spread to the wealthier districts. As if the threat of disease was not problem enough, bread became scarce, and some of the sick may actually have died of starvation, rather than disease. Many houses became tombs, as whole families died from the plague without anyone from the outside world even knowing. Streets were deserted, and all trades were abandoned. Inflation soared. In 544, Justinian?s legislation of price controls was partly successful, but the scarcity of food persisted, especially in the capital. As the taxation base shrank dramatically, financial pressure on the cities also increased. In an effort to economize, civic governments curtailed salaries for teachers and physicians and slashed the budgets for public entertainment.

Although many rural areas were spared from the plague, those areas infected were crippled. This, in turn, affected the urban areas, since a reasonable harvest was essential to ensure that the cities would not experience food shortages. In Syria and Palestine, the plague reached the interior farmlands after the planting, and the crops ripened with no one to harvest them. Heightening this existing problem in Syria, some sort of disease, possibly anthrax, attacked cattle in 551, causing fields to be left unplowed due to lack of oxen.

Taxes on farmland whose owners died of plague became the responsibility of the neighboring landholders. In actuality, this regulation, had existed as a standard practice in the empire long before the plague years. Procopius, however, always a champion of the landowning class, bitterly complained about this law. It is likely that with the high mortality rate of the plague, this practice had become extremely burdensome. In 545, Justinian attempted to ease the financial distress of these landowning subjects by ruling that unpaid taxes on these deserted properties should not be charged to the neighboring landowners. Apparently, the owners of neighboring properties had been forced to pay debts on the abandoned lands. This may have been the specific source of Procopius? complaint, rather than the former practice.

The plague also attributed to the shrinkage of two particular groups in the empire, namely the army and the monastic houses. Even without the shortage of manpower caused by the plague, recruits for the army had become increasingly more difficult to find, with the result that the empire was mostly served by barbarian mercenaries. The campaigns for expansion and reunification of the west with the eastern Roman empire served as a conduit for sacrificing immense numbers of soldiers. In Justinian?s final years, there were virtually no men either to volunteer or to be impressed into the service. Fortunately for the Romans, the plague had also attacked and weakened the Persian empire. In most other areas of the empire however, they were not so fortunate. In Italy, the Ostrogoths resumed the war, and new revolts broke out in the previously subdued African provinces. There were also renewed threats from the eastern barbarian tribes. Remnants of the Asiatic Avars, whom Chagan Baian had reunited, approached the imperial frontiers for recognition, and the Kotrigur Khan attacked the Balkan territories.

Another group greatly affected by the plague included the monasteries. In the area of Constantinople, records list over eighty monasteries before 542; however, after the plague, most of these seem to disappear. There is no doubt that the plague contributed to this decline. Highly infectious contagious diseases like the bubonic plague thrive in close-knit populations. Much like John of Ephesus? description of unmanned ships washing ashore, it was not uncommon for an entire monastery to be wiped out by the plague during the Black Death.

Although there were these setbacks in the growth of the clergy, the Byzantine empire moved into closer alliance with the church in the crises of the sixth century. Surrounded by disasters, the religiosity of the people increased, and the church financially benefited from private resources which would have previously supported civic projects. Although building activity continued in the empire, indicating that some level of prosperity persisted, the types of construction changed. In Syria for example, there was a marked shift from civic construction to the building of churches and monasteries by the middle of the century. The public sector wealth which paid for civic construction relied upon tax revenues, which had been greatly depleted by the plague. In comparison, the church could receive funding from private donors, individuals whose purse strings were loosened by their brush with death.

Unfortunately, the bubonic plague was not the only disaster of the time. In the Secret History, Procopius catalogued the natural catastrophes, including floods and earthquakes, as well as barbarian invasions, that had afflicted the empire since Justinian began his reign in 518. He claimed that at least half of the survivors of these previous calamities then died of the plague. Also, after the initial outbreak in 541, repetitions of the plague established permanent cycles of infection. To explain these events, Procopius in his Secret History stated that God had turned away from the empire because it was ruled by a demon emperor. Excellent religious symbolism of this theory was provided with the collapse of the original dome of Hagia Sophia, following an earthquake which had beset the capital. Of course in his official History of the Wars, Procopius had claimed that human beings were not capable of understanding why such disasters occur.

During the reign of Justinian, the classical literary tradition was in the process of being adapted to Christian culture and history. A Christian writer could not employ the classical notion of moira as a causal factor in history. These factors had to be replaced with a Christian explanation of sin leading to punishment. Although Procopius regarded religious events as inappropriate for his histories, he is clearly the last of the classical historians in this respect. After Procopius, most Roman historians use sin as a historical causal factor. This is especially apparent in the Christian plague accounts.

The Christian writers, whose literary plague model was the Book of Revelation, clearly felt that the plague was a punishment sent by God in response to human sinfulness. "It was known," wrote Zachariah of Mytilene, "that it was a scourge from Satan, who was ordered by God to destroy men." Near Antioch, St. Symeon the Younger tearfully prayed to Christ, and received the reply, "The sins of this people are manifold, and why do you bother yourself about their diseases? For you love them no more than I." To save the saint grief, however, God granted Symeon the power to heal the believers. In this way, many who were infected with the disease called on St. Symeon, and were cured. Gregory of Tours in Gaul also wrote about St. Gall, who saved his flock from the plague. Through these accounts, it is clear that the Christian writers felt the sufferings caused by the plague were the justifiable punishments of God, but also that the faithful should be saved by their belief in Christ.

To modern readers, the accounts of the plague, even those of the Christian writers, seem strikingly sober, given the magnitude of the disaster. Procopius and Agathias, like Thucydides before them, employed a detached, almost agnostic, stance, while the Christian writers accepted the plague as a just punishment from God. Unlike the Black Death, the Justinianic plague appears not to have been accompanied by mass hysteria, flagellant processions, or persecutions of the Jews. The general populace seems almost accepting of the calamity. John of Ephesus reported visions, but even these are nothing compared with the wild descriptions which accompanied the Black Death of the fourteenth century. Henry Knighton, who wrote a chronicle in England during the Black Death, claimed that the earth had swallowed many cities in Corinth and Achaia, and in Cyprus, the mountains were leveled causing the rivers to submerge the nearby cities. The hallucinations described by John of Ephesus could be a symptom of the plague, but the description indicated by the medieval chronicle illuminates a greater hysteria. The attitude indicated by the Christian writers during the Justinianic plague, however, paralleled a common fourteenth-century interpretation of the Black Death; that is, it was caused by the wrath of God.

The Justinianic plague, apart from its devastating immediate impact, is generally viewed as undermining the late Roman empire, politically and economically, creating conditions ripe for disaster. Coupled with the other disasters of the reign of Justinian, the plague may have reduced the population of the Mediterranean world by the year 600 to no more than 60 percent of its count a century earlier. Such a massive mortality rate would naturally lead to social and economic ruin. Also, the depopulation of the urban centers might have created a structural imbalance in favor of the desert Arabs.

The main problem with this thesis is the lack of firm demographic evidence for the late Roman empire. Before plague mortality can be determined, modern scholars need an estimate of the overall population of the empire for this period. Unfortunately, this information has not been effectively determined. There are also other problems in calculating definitive population data. Although any kind of epidemic disease has severe effects on a previously unexposed population, the recurrences of that disease would not be as devastating. Also, the "dark age" of Byzantine literature which follows the reign of Justinian fails to firmly document these recurrences of the plague. The many other natural catastrophes during this period constitute another problem when trying to determine plague mortality. Even if it could be determined that 300,000 people perished in Constantinople during the spring of 542, there would still be a question whether these individuals died from the plague or in the massive earthquake which also occurred at this time. The sources to discover this type of information unfortunately do not exist.

Because scholars have been unable to determine the overall population, they have attempted to conclude the mortality rates in well-documented cities, such as Constantinople. The population of Constantinople, however, has also not been determined conclusively. Data used by modern scholars is generally based on the literary descriptions of the plague, which are very likely colored by exaggeration. John of Ephesus stated that people died at a rate of 5,000 to 16,000 a day, and that men at the city gates stopped counting the exiting corpses at 230,000 when they realized the bodies were innumerable. Procopius claimed that 10,000 people died a day, and that the plague lasted for four months in Constantinople. Based on these figures, it is possible that one-third to one-half of Constantinople perished. Although this conclusion seems high, John of Ephesus, who was travelling during the first outbreak of the plague, noted that the deaths in Constantinople exceeded those in other cities. Urban mortality rates are inconclusive in most of the other large cities of the empire. Some cities became practically deserted from the plague, while others, especially those which were not trade centers, were less affected.

Faced with these difficulties, and in light of the need for additional demographic data, scholars have postulated an overall mortality rate for the empire of about one-third of the population, which, not surprisingly, happens to be a figure comparable to the toll probably taken by the Black Death. Comparisons with the demographic patterns following the Black Death have also led some modern scholars to postulate that the plague might not have caused permanent damage to the Roman Empire. This theory, however, is based off of invalid comparisons, which assume similarities based on the fact that both plagues were bubonic in nature. Although the evidence for the plague being devastating to the empire stems from vague and unquantifiable literary accounts, the evidence to the contrary is not conclusive.

For example, after the Black Death, the marriage rate increased sharply, and resulted in prolific unions. Agathias observed, however, that young men suffered the most from the plague. If this observation was true, combined his statement that the plague recurred at fifteen year intervals, this clearly would have caused disastrous demographic consequences. One scholar has pointed out that the Egyptian papyri give no indication of either economic crisis or even a population decline during the plague. Although this is troubling, John of Ephesus did state that Alexandria was not affected like the city of Constantinople. Also, the sources do not indicate that the plague struck Egypt again after 541. Another objection is that despite literary sources recounting tales of bodies overflowing graveyards, nowhere has any archaeologist working in the Near East discovered a plague pit. It seems probable, however, that further archaeological investigations will counter this objection.

These questions do not deny the existence of the plague, but simply challenge whether it had enduring catastrophic effects on the empire. The Black Death in medieval Europe has been described as having a "purgative rather than toxic" effect on what had previously been an over-populated society facing Malthusian checks. Following the Black Death, a lower people-to-land ratio was produced, causing wage inflation. In 544, Justinian issued a law which vetoed pay increases for artisans, laborers, and sailors, in an effort to control wage inflation. Although higher grain prices dampened real wages immediately after the plague, the population decrease clearly benefited the lower economic classes. It is important to remember, however, that this comparison can only stretch to an extent; in contrast with fourteenth-century Europe, there is no hard evidence that the late Roman empire was overpopulated. Although it is clear that the plague did devastate the empire, at least temporarily, it is necessary to remember that the Roman Empire in 600 was still a powerful state, facing favorable political conditions, and supported by a prosperous economy.

Throughout history, plagues have severely affected human societies. To understand their effects, however, there is a need for much demographic and archaeological research. Many of the archaeological investigations conducted in the Near East have not been carried out in a sufficiently methodical manner; they have been in effect, exercises in treasure hunting. In Athens, few digs have concentrated on the problems presented by the plague. The superimposition of modern cities on these ancient sites has also hampered archaeological investigations in some areas of the greatest importance, notably Constantinople. Politics have, unfortunately, also played a part in these difficulties. In the future, perhaps new investigations into the mediums of archaeology and demographics will offer more insights into the effects and consequences of the Athenian and Justinianic plagues.

http://www.loyno.edu/~history/journal/1996-7/Smith.html
 
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