Antonine Plague

• 1. Origins And Transmission

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  Roman soldiers returned from the siege of Seleucia in the winter of 165 to 166. They carried a disease back to their homeland after violating a temple during the Parthian campaign of Lucius Verus. The first documented case appeared in Smyrna, Roman Anatolia, in 165. There the orator Aelius Aristides nearly died from the illness. From that eastern point, the plague spread westward. It reached Rome by 166 and touched nearly every corner of the empire by 172. Ancient sources attribute the cause to this specific military movement. Soldiers acted as vectors moving infection across vast distances. Connectivity between land and sea made transfer easier than in smaller societies. Nine recorded epidemics had struck the empire before 148 AD. This outbreak was different because it arrived with returning troops.

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• 2. Epidemiological Diagnosis

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  Greek physician Galen traveled from Rome to Asia Minor in 166. He returned to Rome in 168 when summoned by co-emperors Marcus Aurelius and Lucius Verus. Galen observed the epidemic among troops at Aquileia in the winter of 168 or 169. He described fever, diarrhea, pharyngitis, and skin eruptions appearing on the ninth day. These eruptions were sometimes dry and sometimes pustular. Scholars generally diagnosed the disease as smallpox based on these red and black skin lesions. Recent genetic evidence suggests severe smallpox did not arise in Europe until much later. Measles has also been proposed as a possible cause. J. F. Gilliam concluded in 1961 that there is insufficient evidence to identify the pathogen definitively. No genetic material exists from the Antonine plague itself. Molecular estimates place the evolution of measles sometime after 1000 AD. The description provided by Galen remains inconsistent with modern definitions of smallpox.

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• 3. Demographic Collapse

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  The Roman Empire held an estimated population of 75 million people during this period. Historians agree the population peaked around the time the plague appeared. Thereafter the population declined sharply. Estimates of fatalities range from 2 to 33 percent of the total empire. Most figures coalesce around a fatality rate of about 10 percent. This equals roughly 7.5 million deaths out of the total population. Death rates reached up to 15 percent within cities and the army. Cassius Dio reported that up to 2,000 people died daily in Rome nine years later in 189. At least one study finds the origin of measles post-dates the plague. Another study finds measles emerged well before the Antonine Plague. The average life expectancy at birth was only in the mid-twenties. More than half of children died before reaching adulthood. Rome itself housed an estimated one million residents. About 20 percent of the population lived in hundreds of cities.

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• 4. Military Devastation

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  The ancient chroniclers portray the plague as reducing the army almost to extinction. This crisis began in 166 at the start of the Marcomannic Wars. Germanic tribes invaded territory south of the middle Danube. They attacked regions now known as the Czech Republic and Slovakia. They also moved south toward Italy. Manpower shortages forced Marcus Aurelius to recruit gladiators, slaves, and bandits. The plague decimated ranks while weakening strategic positions. After a two-year delay, the emperor launched an attack against invaders in 169. By 171 Roman forces drove them out of their territory. The war continued sporadically until 180 when Marcus Aurelius died possibly from the plague. Co-emperor Lucius Verus died from the plague in 169. The ongoing conflict contributed to a cycle of instability along the frontier. The plague may have impacted the Germanic tribes as well.

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• 5. Economic Disruption

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  Roman commercial activity in the Indian Ocean suffered a major setback after the plague. Trade extended to the Indian subcontinent and Southeast Asia from ports in Roman Egypt. Archaeological records show this disruption likely contributed to broader economic decline. Social instability followed throughout the empire in the years that came next. Conditions were propitious for a pandemic despite economic prosperity. Dense urban populations and poor sanitation increased disease dangers. The death rate exceeded birth rates requiring constant new resident migration. Connectivity by land and sea made transfer of infectious diseases easier than in smaller societies. Epidemics of infectious diseases in the empire were common with nine recorded between 43 BC and 148 AD. The rich were not immune to unhealthy conditions. Only two of emperor Marcus Aurelius' fourteen children reached adulthood. Average height declined during the Roman era reflecting stresses of urbanization and warfare.

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• 6. Climate Correlations

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  A VE7 volcanic event occurred at Taupo New Zealandia in 173 AD. These events are rare occurrences. Major plagues significantly impacting the Roman Empire are strongly linked to cooler and drier climate conditions according to 2024 research. Colder weather may have contributed to spread of these diseases during that time. Climate stress interacted with social and biological variables such as food availability. Rodent populations and human migration also played roles making populations more susceptible. The Antonine Plague, the Plague of Cyprian, and the Plague of Justinian all fit this pattern. Historians differ on whether the plague was the beginning of decline or just a minor event. A team of six historians questioned extreme positions suggesting less catastrophic outcomes. They affirmed disease and climate had some impact described by Kyle Harper. The ancient world never recovered from the blow inflicted by the plague visiting it in the reign of Marcus Aurelius. Scholars continue to debate the exact nature of the pathogen causing these outbreaks.

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