Wars of conquest that weakened the Roman Empire | Anthony Kaldellis and Lex Fridman

In this discussion, Kaldellis evaluates Emperor Justinian's reign through a nuanced historical lens, presenting both accomplishments and significant failures. Justinian launched wars of conquest justified by his belief that God authorized him to reconquer lost Western Roman provinces. He was strategically opportunistic and initially successful in exploiting weaknesses in barbarian kingdoms, particularly in North Africa. However, his expansionary wars came at tremendous cost: provinces like Italy were ravaged for decades, economic sustainability was questionable, and military resources were dangerously overstretched.

A critical failure was Justinian's decision to strip armies from the Eastern Roman Empire's heartland to support western conquests. This left the empire vulnerable to Persian invasion, resulting in the destruction of Antioch—a major strategic loss that undermined territorial gains elsewhere. Kaldellis argues this cannot be offset by conquering North Africa, as surrendering Syria represents a fundamental strategic miscalculation.

On the positive side, Justinian's architectural and institutional achievements were substantial. He rebuilt Constantinople and commissioned the magnificent Hagia Sophia, though notably this reconstruction followed the Nika Insurrection, a devastating uprising where his forces massacred over 30,000 protesters and inadvertently set fire to much of the city. Kaldellis characterizes Justinian's legacy as deeply mixed—grand in both scale of accomplishment and failure—making him difficult to definitively rank among emperors.

Regarding the Plague of Justinian (541 AD), Kaldellis challenges the common historiographical claim that it killed half the empire's population. While recent laboratory science has identified the pathogen as Yersinia pestis, establishing mortality rates and historical impact requires traditional historical analysis. Kaldellis adopts a "moderate impact" position rather than the "maximalist" 50% mortality estimate, arguing that such devastation would have halted society entirely. Evidence from Justinian's own era contradicts this: taxation continued, courts functioned, and military campaigns on multiple fronts proceeded without pause or documented plague impact. Comparisons to the well-documented Black Death in 14th-century Europe show much more severe societal disruption than observed in the 6th century.

Justinian left the empire overextended with fewer concentrated military forces in its homeland, making the center vulnerable to Balkan raids and entering a vicious cycle of problems. While successors bore some responsibility for mishandling this difficult situation, Kaldellis assigns primary responsibility to Justinian's strategic overreach, though acknowledges the plague did contribute to subsequent 7th-century turmoil.