#498 – Anthony Kaldellis: Roman Empire, Byzantine Empire, Rise & Fall of Empires

Episode Summary

Executive Summary: Anthony Caldellus argues that the so-called Byzantine Empire was simply the Roman Empire continuing unbroken, held together by taxation, bureaucracy, shared Roman identity, and a governing persona that promised responsiveness and accountability. The conversation traces major turning points—from Caracalla and Diocletian to Constantine, Justinian, Heraclius, and the Macedonian revival—showing how external shocks, not internal decay, usually drove crises, while the state repeatedly stabilized through institutions and consensus.

Main Topics: Rome, Byzantium, and historical terminology (Priority: 5/5): Caldellus rejects 'Byzantine Empire' as a retrospective label, arguing the eastern state always saw itself as Roman and should be understood as the long continuation of Roman political history. State continuity through taxation and bureaucracy (Priority: 5/5): The empire’s durability is attributed to censuses, taxation, administrative reach, and a system that made subjects legible to the state and able to petition it, rather than to conquest alone. The imperial persona and political legitimacy (Priority: 5/5): The emperor projected a consistent image of responsiveness, hard work, accountability, and public service; this rhetoric generally aligned with action because rulers depended on popular consent and fear of usurpation. Christianization and Roman identity (Priority: 4/5): Christianity became powerful only after imperial adoption; Rome did not simply vanish into Christianity, but absorbed it. Roman, Greek, and Christian identities coexisted and shaped East Roman society in overlapping ways. Crises, external shocks, and resilience (Priority: 5/5): Major disruptions—the third-century crisis, Arab conquests, Seljuk losses, the Fourth Crusade—were primarily external shocks. The key story is how the Roman state repeatedly regrouped after them. Key emperors and structural change (Priority: 4/5): Diocletian rebuilt the state and taxation system; Constantine founded Constantinople and redirected imperial gravity eastward; Justinian codified law and reconquered territory; Heraclius reversed Persian gains but could not prevent Arab expansion. Why the empire ultimately fell (Priority: 4/5): Caldellus locates the irreversible decline in the early 14th century, when Asia Minor was lost, civil wars intensified, and the state’s tax base and strategic depth collapsed, leaving the empire unable to recover.

Key Arguments: The 'Byzantine Empire' is a historiographical invention; the people of the East called themselves Romans and the state remained legally and culturally Roman. Roman longevity came from a durable consensus: the state taxed subjects, but in return it offered protection, legal order, and avenues of petition. The emperor was not an unchecked autocrat in practice; because there was no secure right to the throne, rulers had to maintain public goodwill to avoid coups and civil wars. The gap between rhetoric and action was relatively small because the imperial system incentivized rulers to actually deliver what they claimed. Caracalla’s citizenship edict mattered because it broadly extended Roman citizenship and normalized imperial inclusion, making provincial elites into Romans in a real legal sense. Diocletian’s reforms created a bigger, more systematic state—especially taxation and census capacity—which stabilized the empire after the third-century crisis. Constantine’s founding of Constantinople shifted the center of gravity eastward and created a new Roman political core that outlasted the old capital. Christianity spread through imperial patronage, incentives, and restrictions on pagan practice, but it also became a unifying identity for Roman subjects. The empire’s major crises were usually caused by foreign invasions or external pressures, not by a slow internal moral decay. The Western Empire fell because it lost revenues and military capacity after repeated territorial losses; the East survived because it retained its core, its tax base, and strategic geography. Justinian’s achievements were mixed: he strengthened law and prestige, but his wars overextended the empire and weakened its defenses elsewhere. The empire’s final collapse was driven by the loss of Asia Minor, repeated civil wars, the Black Death, and the disappearance of the structural sources of resilience.

Data Points: Roman state duration: about 2,200 years - From the traditional founding of Rome in 753 BC to the fall of Constantinople in 1453 AD Founding of Rome: 753 BC - Used as the starting point for the long Roman historical arc Fall of Constantinople: 1453 AD - Marks the end of the Roman state in the East Diocletian’s reign: 284–305 AD - Presented as the key reformer of the late Roman state Augustus and the Principate: 27 BC - Approximate start date of imperial monarchy after the end of the Republic Western Empire falls: 476 AD - The last Western emperor is deposed Edict of Caracalla: 212 AD - Extended Roman citizenship broadly to free inhabitants of the empire Crisis of the third century: 26 emperors murdered in 50 years - Illustrates extreme instability and civil war in the third century Plague of the third century: 249–262 AD - A devastating pandemic that damaged the tax base and army recruitment Constantinople population growth: from about 25,000 to 500,000 in two centuries - Attributed mainly to immigration from the provinces Constantine’s imperial victory: 324 AD - He becomes sole ruler of the Roman Empire Founding of Constantinople: 330 AD - Constantine creates a new Roman capital in the East East-West split: 395 AD - A long process of jurisdictional division, not a sudden break Justinian’s reign: 527–565 AD - Period of codification, reconquest, and major building projects Plague of Justinian: 541 AD - Discussed as a serious but not empire-ending pandemic Byzantine civil-war vulnerability: 46% - Approximate share of Constantinople emperors overthrown by violence Arab conquests: 630s - One of the three main catastrophic territorial losses Seljuk loss of Asia Minor: 1070s - A rapid and transformative territorial setback Fourth Crusade sack of Constantinople: 1204 - Major crisis that dismembered the empire but did not end it Initial Christian share under Constantine: about 10% maximum - Estimated upper bound for Christians in the empire at Constantine’s conversion era Population decline threshold after late empire losses: early 14th century - Caldellus says the sources of resilience dry up around 1300–1350 Military strength of the East Roman state: 100,000–250,000 - Approximate military size across different periods

Pivotal Quotes: "the burden of proof is on those who would assert that what we've been calling the Byzantine Empire is something other than the Roman Empire" — Anthony Caldellus: He argues that the eastern state is the direct continuation of Rome, not a separate civilization "the emperors and the authorities were generally sincere in what they said. In other words, I have found that they generally did what they said they were going to do overall" — Anthony Caldellus: On the relationship between imperial rhetoric and actual governance "the crisis that this polity undergoes are a discrete number of them... they are all sudden challenges that appear from the outside" — Anthony Caldellus: On why he sees invasions and shocks, not internal decay, as the main causes of collapse

Implications: The episode reframes Byzantium as a resilient Roman state built on institutions, legitimacy, and taxation. For historians and policymakers, it suggests long-lived systems survive by aligning rhetoric, incentives, and public goods, not by force alone.