Did the plague kill half the Roman Empire? | Anthony Kaldellis and Lex Fridman
Anthony Kaldellis discusses the Plague of Justinian (541 AD), arguing against the maximalist claim that it killed 50% of the Roman population. He contends that modern pathogen identification combined with historical evidence shows the plague had far less impact than commonly assumed, as evidenced by Justinian's continued military campaigns and taxation during the outbreak.
Summary
In this discussion, Kaldellis addresses the historical debate surrounding the Plague of Justinian and its demographic impact on the Roman Empire. He notes that recent laboratory science has confirmed the pathogen as Yersinia pestis, replacing previous guesswork. However, he emphasizes that identifying the pathogen does not automatically determine mortality rates or historical impact—this still requires traditional historical methodology.
Kaldellis expresses skepticism toward the maximalist position claiming 50% mortality, arguing this would have logistically halted society entirely. He instead advocates for a much more moderate impact assessment. His primary evidence comes from examining what actually happened during the plague period: Justinian continued waging war on four or five fronts simultaneously, with no narrative pause or disruption to military operations. Taxation and court functions continued uninterrupted, with no visible impact on governance or military conduct.
Kaldellis draws a comparative example from the Black Death in 14th-century Europe, where detailed records show societal breakdown lasting several years before recovery. Since this collapse is absent from 6th-century sources during the Justinian plague, he concludes the actual mortality and social disruption must have been significantly lower than the 50% claim. He positions this as an ongoing scholarly debate with multiple interpretive possibilities.
Key Insights
- Recent laboratory science has confirmed the Plague of Justinian was caused by Yersinia pestis, replacing previous guesswork, but identifying the pathogen still does not determine actual mortality rates or historical impact without traditional historical work.
- Kaldellis argues that a 50% mortality rate would have logistically brought Roman society to a complete halt, making the maximalist position implausible given the continuing evidence of military and administrative function.
- During the Plague of Justinian, Justinian continued waging war on four or five different fronts with no narrative pause or disruption, suggesting the plague's actual impact on military operations and recruitment was minimal.
- Historical records from the Black Death in 14th-century Europe show societies stopped most activities for years during recovery, but 6th-century sources show no such societal breakdown during the Justinian plague.
- Taxation and court functions continued uninterrupted during the Plague of Justinian with no visible disruption in the historical narratives, providing evidence for lower actual mortality than the 50% claim.
Topics
Transcript
[0:02] There's a grand scale to the good and the bad. >> Yes. Yes. >> For many people that's what makes for a >> Exactly. >> top 10 emperor list. >> Uh what about the plague? >> Well, he wasn't responsible for that at least. >> [laughter] >> Okay. >> The the plague of Justinian. >> Yes. >> AKA 541 AD. So, some historians claim that it killed half the population and ruined the empire. Uh you are skeptical on this view. >> Yes. So, this is a bubonic plague. [0:33] Um which lasts uh more or less for two centuries. It comes and it goes. And it's kind of endemic to large parts of the world. 541 is when…
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