The dissolution of the Western Roman Empire is popularly perceived as a sudden and dramatic cataclysm, with the “fall” of classical civilization often precisely dated to 476 CE. In that year, so the story goes, the child Emperor of the West, Romulus Augustulus, was deposed by the barbarian warlord Odoacer who then established the first barbarian Kingdom of Italy. However, this familiar version of the fall of Rome can charitably be described as “incomplete.”
By 476 CE, the political power structures that underlay the Empire had long ago shifted to Constantinople, the capital of the East. Over a century earlier, Constantine I had effectively made the eponymous capital the center of the Roman political world. In the year Constantinople was founded on the existing city of Byzantium (324 CE), Constantine had just defeated his former ally, the pagan Eastern Emperor Licinius, becoming sole ruler of a united Empire.
While Constantine himself wasn’t necessarily Christian in any recognizable sense during most of his lifetime (he was baptized on his deathbed by an Arian bishop), his victories in the civil wars (against Maxentius in Rome and Licinius in the East) were contemporarily viewed within a religious context. Constantine’s adoption of the Chi-Rho-adorned labarum (which would become the universal military standard of the late Empire) was inspired by his famous vision before the Battle of the Milvian Bridge rather than any devout adherence to existing Christian belief. Nevertheless, the end of the civil wars was perceived (and propagandized) as the spiritual triumph of Christianity over the traditional gods of the state. After the collapse of the Roman political system in the Crisis of the Third Century, and its tenuous rebirth and regression to chaos in the civil wars of the Tetrarchy, it must have been especially salient to see political stability finally return alongside the symbolic defeat of the one decrepit state institution that had so far survived—the old religion.
It’s important to note that Constantine and his cultishly-devoted soldiers believed in a world of many deities to whom competing interests could be appealed in order to win favor on the battlefield (a blend of religious exceptionalism and henotheism was the prevailing norm of the time). So unremarkable was this belief that the pagan Licinius informed his troops not to lay eyes on Constantine’s labarum out of real fear that its magical power would curse them. Constantine himself simultaneously favored the Christian God and the popular sun deity Sol Invictus, perhaps seeing them as manifestations of the same being. It’s worth noting that the Arch of Constantine was positioned so that it aligned with Colossus Solis, the colossal statue of Sol Invictus that once stood near the Colosseum (which derived its name from the statue). The dramatic shift in Roman semiotics that characterizes this period was undoubtedly facilitated by Constantine’s imposition of his own understanding of Christianity on the Roman political and military cultures.
Beyond the defeat of Licinius and the symbolic victory of Constantine’s pseudo-monotheism (sun worship and Christianity) over the traditional pagan religion of the old Roman state, Constantine had other reasons to move the capital to Greece. Greek culture had shaped the adopted norms of Roman elites for centuries; it’s informative that Suetonius reported the then widely-held belief that the last utterance of Julius Caesar was the Greek phrase “καὶ σὺ, τέκνον” to his friend Marcus Junius Brutus, while Caesar’s famous “Commentāriī dē Bellō Gallicō” was explicitly made to further endear him to the masses. Thus, Constantine’s transfer of Roman central power to Greece represents a logical transition in the wake of decades of destructive in-fighting and the resultant decay of long-standing political institutions and networks in and around Rome itself.
The political vacuum in Rome was destined to be filled by the Christian Church. Internecine feuding among the various leaders of the nascent church throughout the Empire increasingly left Rome and its bishops (mostly members of the ancient families of the senatorial class) the vanguards of what would become Nicene Christianity. The city of Rome itself gradually became a merely symbolic if not spiritual capital. More often than not, political power in the west would lay elsewhere; in Mediolanum (Milan), Augusta Treverorum (Trier), and Ravenna. For example, it was from Trier in Gaul that Valentinian I, the last Western Emperor who wasn’t a mere figurehead, ruled the West in the mid-to-late fourth century.
Thus, while the sack of Rome in 410 CE by Alaric and the Visigoths during the reign of the Western Emperor Honorius amounted to a humanitarian disaster for the city’s people, it was a symbolic defeat that, in and of itself, had little real impact on the political stability of the Empire as a whole even though it led to widespread consternation among Christians. Indeed, Augustine’s seminal work, The City of God, was a direct response to the spiritual misgivings that had swept through the Empire in the wake of the sack of Rome.
By then, the disastrous reign of Honorius (who became Western Emperor at the age of ten) had all but ensured that future Emperors in the West would be little more than puppets. The 400s were marked by the ascendency of de facto rule by the Magister Militum (“Master of Soldiers”) in the Western Empire, essentially the supreme commander of military forces.
At this point, it’s worth emphasizing that the Roman armies of the West were increasingly populated by men who would have been perceived as only nominally Roman if not “barbarian.” The Magister Militum Flavius Stilicho, who held true power during the reign of Honorius, was himself the son of a Germanic Vandal and a provincial Roman woman. Indeed, military service had gradually become synonymous with barbarian identity, and the Roman soldiery was eventually comprised of a motley assortment of men of disparate ethnic backgrounds who came to speak a blend of Latin and Germanic languages distinctive to the Roman military. Trousers, long associated with “barbarians,” became widely adopted by Roman soldiers. Among them were “first-generation Romans” who came from migrant families that had only recently settled within the Empire or along its borders, as well as men whose families had considered themselves Roman for generations. It was largely this amalgam of military men, who often simultaneously held allegiance to the Roman state and to the various branches of Germanic tribes to which they belonged, that would ultimately come to gain complete political control of fragments of the Western Empire.
Odoacer provides an instructive example of the gradual shift towards “barbarian” military rule in the West. In fact, unlike the Visigothic “King” Alaric, Odoacer did not explicitly identify with any one tribe or group of people (his ethnic origin remains hotly debated). However, like Alaric, who was in fact a Roman military commander who served under the Eastern Emperor Theodosius before he rebelled and eventually attacked Rome, Odoacer too was a Roman military officer.
Shortly after the Eastern Emperor Zeno appointed Julius Nepos to be the Western Emperor in 474, Nepos was betrayed by his Magister Militum, a Roman aristocrat named Orestes who had come to notoriety as a secretary and envoy in the court of Atilla the Hun. The fact that Orestes chose to remain Magister Militum, instead proclaiming his young son Romulus Augustus the new Western Emperor, is an indication that the existing military establishment in the west viewed the imperial title as little more than ceremonial by this point (importantly, this was not the case in the east, where the Eastern Emperor was no figurehead).
Nevertheless, Nepos had escaped to Dalmatia, and Zeno refused to recognize Orestes or Romulus Augustus, considering them usurpers. It was in this context that the Roman officer Odoacer (who claimed no noble lineage), led the foederati (members of “barbarian” tribes from beyond the borders of the Empire proper who were bound by treaty to serve in the Roman military) to revolt against Orestes when he refused to cede to their demands for permanent land and housing within Italy. In fact, the largely Germanic foederati were joined by much of the standing Roman army (that is, ostensibly ethnic “Romans”).
When Odoacer defeated Orestes and deposed the usurper Romulus Augustus, Odoacer sent a senatorial delegation to Zeno to return the regalia of the Western Roman Emperor. Zeno bestowed Odoacer with Patrician rank, and granted him authority to rule Italy in the name of Julius Nepos. While Odoacer observed political niceties, officially ruling in the name of Nepos and Zeno, he never allowed Nepos to return to Italy.
Was Odoacer’s rise to power the end of Roman rule in Italy? What about the rest of the Western Empire? The better question to ask is: What would the people who lived in Western Europe have thought?
For the Romans who’d survived the especially violent upheaval of the period (seemingly endless invasions, sieges, civil wars, famines, uprisings, and mass migrations), self-perceptions about political identity across continental Europe seemed to change little but for the fact that the small groups of men in power were foreigners who were no longer truly answerable to any Emperor. In some cases, the initial fiction of unbroken Roman political continuity in the West even included the minting of coins depicting the Eastern Emperor. Yet, while Germanic conquerors held political leadership, some portion of the bloated governmental bureaucracy that had developed across both halves of the Empire in the fourth and fifth centuries remained intact. The well-to-do continued to be educated in Latin and Greek, to study classical literature and philosophy, and aspired to bishoprics and governmental appointments (under Franks in Gaul or Visigoths in Spain). Roman populations under Germanic rule throughout Europe and the Mediterranean more or less remained Roman, and for the most part, so did their societies and cultures, at least in the beginning.
Despite popular perceptions that Romans were supplanted by Germanic populations, genetic evidence is finally settling the question of just how great the impact of barbarian migrations was on the demographics of the Western European populations that emerged from the carnage of late antiquity. It turns out that the answer is: Not very.1,2It was only quite gradually that the populations of Europe would come to see themselves as having a socioculturally distinct ethnicity synonymous with that of their conquerors rather than as being one pan-European “Roman” people. While the notion that there was ever a singular Roman identity may seem an oversimplification, it’s worth remembering that the cosmopolitan classical Empire had included a heterogeneous mix of peoples who were nevertheless united by a common subsuming Roman culture, so that ardent adherents of the very same mystery cults were as likely to be found in Britain as in Syria, to say nothing of the common worship of manifestations of the old Greco-Roman gods.
The Romans of Western Europe weren’t replaced; instead, over generations, they adopted the identities of their new masters. However, this was a transformation that went both ways, and Germanic peoples became Romanized to varying degrees, their languages and traditions gradually fading away or transforming so as to be ultimately unrecognizable. This paved the way for the incubation of the distinct, nascent European cultures that would develop in the ensuing centuries.
These cultural transformations were accompanied by truly staggering declines in infrastructure, technology, and economic sophistication. During the Roman Principate (the period that typically comes to mind when one thinks of “the Roman Empire,” stretching from the reign of Augustus to the Crisis of the Third Century ), the European/Mediterranean economy reached heights that would be unequaled for another thousand years. This was largely facilitated by an infrastructure of ports and roads that were built, maintained, and secured by the Roman military. Not only did these roads fall into disrepair and banditry, they now spanned a patchwork of territories controlled by Germanic invaders and bands of what might have once been called Roman soldiers but who were now loyal to various competing warlords. The gradual loss of freedom of movement and travel was accompanied by declines in trade. This only further served to accelerate economic decline that had begun during the Crisis of the Third Century and the civil wars that followed.
Greenland ice core data gives an indication of the level of global lead production, which closely tracks the fortunes of the Roman economy (see below).3 Amazingly, lead production levels would not surpass those of the Roman Principate until mere decades before the American Revolution. It’s worth noting that the period in which lead production bottoms out was a time in which the most powerful political leader of Western Europe—Charlemagne—was illiterate, scrupulously learning to read and write well into adulthood. Dark Ages indeed.
And what of the Italian peninsula after 476? Zeno ultimately sought to remove Odoacer from power, employing yet another group of foederati, this time a distinct tribe of Romanized Goths called the Ostrogoths. Their leader, Flavius Theodoricus (known to history as “Theoderic the Great”), had been made Magister Militum in Constantinople and even served as consul. After Zeno promised Theoderic control of Italy, the Ostrogoths invaded the peninsula and defeated Odoacer’s forces. A peace treaty negotiated by the bishop of Ravenna ensured that both Odoacer and Theoderic would have joint control of Italy. At a feast meant to celebrate the peace between them, Theoderic drew his sword and personally killed Odoacer in front of the gathering.
Just as Odoacer had done before him, Theoderic pledged to rule the lands of Italy in the name of Zeno, but his was less of an empty promise. The Roman political infrastructure that had existed before Odoacer’s revolt was largely restored including Roman legal codes, and Theoderic allowed free movement of people to and from the Eastern Empire. In return, the Eastern Emperor made the dramatic gesture of sending the Western Imperial regalia to Theoderic, essentially acknowledging him as Emperor of the West. Theoderic was eager to take the role (though never officially), and his reign was characterized by public works, rebuilding of infrastructure, and a deliberate effort to “restore” the symbols of power associated with principate Rome.
Nevertheless, continued tensions with the Eastern Imperial court would eventually spark war in 535, ten years after Theoderic’s death. The Eastern Emperor Justinian I sent his general Belisarius to lead a massive and costly campaign to finally regain proper control of Italy and Rome, the namesake of both Empires and peoples. What followed was two decades of warfare that ravaged the Italian peninsula.
In order to finance 20 years of war, the Eastern Imperial court levied increasingly inordinate taxes on its populace. The war turned out to be a Faustian bargain for the East, driving many of its people to destroy their own buildings and property to avoid the ruinous tax burden, or to sell themselves and their family members into indentured servitude and debt bondage.
Although the Eastern Empire ultimately regained direct control of Rome and Italy, the Gothic War devastated the local population and infrastructure. Crucially, this period coincided with the Plague of Justinian, one of the deadliest pandemics in human history; the plague would ultimately claim the lives of an estimated 25 million people, or more than a tenth of the total global population.
Arguably more than any one event, it was the Justinianic Plague that was the death knell of the classical Roman world; a final, fatal blow against the already fractured civilization. If not for the devastation of the plague, Roman civilization and culture might have continued (perhaps even rebounded and flourished) under Germanic rulers and their assimilated peoples in much of Western Europe with little in the way of dramatic change to the fundamental fabric of Roman society. Ostrogothic Italy provides a window into the stillborn beginnings of what might have been.
Yet by the time the pandemic finally subsided, the major Roman cities throughout the Empire and its former territories saw their populations bottom out. Abandoned infrastructure was now in decay, and ruined public buildings were adapted for any number of new utilitarian functions. The dissemination of specialized knowledge required to maintain the technology that underlay Roman urban life (e.g. indoor plumbing) had long ago largely ceased and eventually faded away. Once splendid villas now crumbled, becoming overgrown, dilapidated husks that dotted the countryside.
By the middle of the sixth century, Rome was a largely empty city of abandoned and ruined buildings; Constantinople didn’t fare much better, with nearly half of its population wiped out.
Though the Roman Empire had withstood the Antonine Plague in the second century, a pandemic that claimed as many as 5 million lives including much of the Roman military, that outbreak had taken place at the zenith of Roman power (and marks the beginning of Roman decline). The Antonine Plague may have paved the way for the Crisis of the Third Century roughly fifty years later (during which yet another plague unfolded, the Plague of Cyprian). Thus, pandemics had the potential to shake the foundations of even a thriving empire.
Not only was the empire not thriving in the sixth century, it was undergoing total collapse and dismemberment. Beyond Italy, Britain had been long-abandoned by the central Roman state, and all of western Europe had been carved into various territories in which self-styled kings and their marauders ruled local populations (e.g. the Gallo-Romans were ruled by the Franks, the Hispano-Romans were ruled by the Visigoths). In some cases, these territories had been taken over by bands of soldiers who had simply been billeted in the region by the Roman state. Although Roman ways of life ostensibly continued but for the change in management, Britain was a different story; archaeological evidence shows a dramatic and rapid decline in the level of technological sophistication there, a process that would unfold more gradually (and less completely) throughout continental Europe.
If any part of the Empire could fairly be described as experiencing the fall of civilization, it was in Roman Britain. Indeed, the desperate state of affairs in Britain may have made the Roman population there especially susceptible to the Justinianic Plague, which further depopulated the island and may have facilitated its conquest and settlement by the diverse Germanic peoples who would come to be called the Anglo-Saxons. In this case too, new genetic evidence is finally overturning the long-held perception that Germanic foreigners completely replaced local Roman populations. Rather than experiencing a massive influx of Anglo-Saxons, it seems that Britain was conquered by relatively small bands of invaders. As was the case in continental Europe, these people have left little genetic imprint on the population.4,5,6 Despite notions long-cherished by some, the idea that the English have a common Anglo-Saxon origin is a myth that has now been conclusively upended by genetic evidence.
Although Rome itself would remain under the control of the Eastern Empire for the next two centuries, the end of the Gothic Wars, the Plague of Justinian, and the subsequent invasion of Italy by the Langobards (better known as the “Lombards”) marked the completion of the gradual destruction of the Western Roman Empire, the ultimate collapse of classical civilization, and the transition into a new Medieval world.
Yet, even though Medieval Europe and classical Roman civilization of the principate (the 1st-3rd centuries) would surely seem mutually alien to people native to each but transplanted across time, the people of the Middle Ages retained more than a patina of cultural continuity with the old civilization, living as they were within its dusty skeleton. The revival of the western Imperial title, bestowed by Pope Leo III upon Charlemagne in 800, offers some sense of the value Medieval aristocracy placed in the pretense of political continuity with Roman civilization. It’s worth noting that the Frankish kingdom Charlemagne ruled, known to historians as the Carolingian Empire, had been known to its own people as Romanorum sive Francorum imperium, the “Empire of the Romans and Franks,” or simply Romanum imperium.
Although the Eastern Roman Empire would come to be known as the Byzantine Empire, this too is a relatively modern historiographical invention; despite the fact that Greek was their lingua franca, the people of the Eastern Roman Empire referred to themselves as Romans and called their empire the “Roman Empire.” The Eastern Roman Empire would go on to face invasions by both Christian Crusaders from the west and Muslim warriors from the east and south, ultimately coming to an end with the fall of Constantinople to the Ottomans and the death of the last Eastern Roman Emperor in 1453. Constantinople was renamed Istanbul and became the center of the Muslim Ottoman Empire until the Empire’s dissolution in the 20th century following World War I and the rise of the Young Turks.
 Amorim CEG, Vai S, Posth C, et al. Understanding 6th-Century Barbarian Social Organization and Migration through Paleogenomics. 2018. doi:10.1101/268250.
 Ralph P, Coop G. The Geography of Recent Genetic Ancestry across Europe. PLoS Biology. 2013;11(5). doi:10.1371/journal.pbio.1001555.
 Greenland Ice Core Evidence of Hemispheric Lead Pollution Two Millennia Ago by Greek and Roman Civilizations, Hong. S. et al., Science, vol. 265, 23 September 1994, page 1842.
 Töpf AL, Gilbert MTP, Dumbacher JP, Hoelzel AR. Tracing the Phylogeography of Human Populations in Britain Based on 4th–11th Century mtDNA Genotypes. Molecular Biology and Evolution. 2005;23(1):152-161. doi:10.1093/molbev/msj013.
 Schiffels S, Haak W, Paajanen P, et al. Iron Age and Anglo-Saxon genomes from East England reveal British migration history. Nat Commun. 2016;7:10408.
 Sayer D. Why the idea that the English have a common Anglo-Saxon origin is a myth. The Conversation. https://theconversation.com/why-the-idea-that-the-english-have-a-common-anglo-saxon-origin-is-a-myth-88272. Published April 26, 2018. Accessed April 28, 2018.