Migration Period reshapes Europe as peoples move across a continent

Story: 400 C.E.  |  Last updated: January 14, 0001

Somewhere around the late 300s C.E., a tide of human movement was already building across Eurasia that would redraw the map of the known world. Over the following two centuries, dozens of peoples — Goths, Vandals, Franks, Slavs, Huns, Bulgars, Anglo-Saxons, and more — crossed rivers, mountain ranges, and old imperial frontiers in one of the largest sustained movements of human populations in recorded history.

What the evidence shows

• Migration Period: Historians date the Migration Period from approximately 300 to 568 C.E., with the pivotal early phase — the Gothic crossing of the Danube — occurring in 376 C.E.
• Population movement scale: Modern estimates place total migration into Roman territory at between 500,000 and over one million people, with single crossings sometimes involving groups of 90,000 to 200,000.
• Post-Roman kingdoms: The movements produced entirely new political entities across Western Europe — the Frankish kingdom, the Visigothic Kingdom in Iberia, and eventually the foundations of what became France, Germany, and England.

A world already in motion

Long before the 300s C.E., the peoples who would drive the Migration Period were themselves the product of earlier migrations. Germanic tribes had been moving out of southern Scandinavia and northern Germany for more than a thousand years, pressing westward and southward, pushing Celtic populations toward the Rhine.

The Huns, probably originating in Central Asia, arrived in Eastern Europe around 370 C.E. and set off a chain reaction. The Tervingi — a Gothic people — crossed the Danube into Roman territory in 376 C.E., fleeing the Hunnic advance. They were granted entry as foederati, allied peoples permitted to settle inside the empire’s borders. Within two years, Roman mismanagement of that arrangement had turned into open war. The Visigoths defeated a Roman army at the Battle of Adrianople in 378 C.E., killing the emperor Valens — a shock that reverberated across the entire Roman world.

That moment was not a beginning so much as an acceleration. The empire had been absorbing, negotiating with, and recruiting from non-Roman peoples for generations. What changed was the scale, the speed, and the breakdown of the central power that had previously managed those relationships.

Peoples from every direction

The Migration Period was never a single movement with a single cause. It was dozens of overlapping stories.

In 406 C.E., a coalition of Vandals, Alans, and Suebi crossed the frozen Rhine into Gaul — an estimated 200,000 people moving in a single crossing. The Vandals eventually reached North Africa, establishing a kingdom there in 429 C.E. The Visigoths, after sacking Rome in 410 C.E., settled in Gaul and then founded the Visigothic Kingdom in Iberia around 460 C.E.

The Franks — a fusion of western Germanic tribes long aligned with Rome — moved gradually into Roman Gaul during the 400s C.E., eventually consolidating power under Clovis after 486 C.E. Their kingdom became the nucleus of what would later become both France and Germany.

Meanwhile, in Britain, Roman control ended in the early 400s C.E., and Anglo-Saxon settlers arrived from what is now northwestern Germany and Denmark. Estimates for that migration range from 20,000 to 200,000 people over the course of the century. Across Eastern Europe, Slavic tribes spread steadily through central, southern, and eastern regions between 500 and 700 C.E., fundamentally reshaping the linguistic and cultural character of half the continent.

The Bulgars, a nomadic group originally from Central Asia, occupied the Pontic steppe for centuries before migrating westward and establishing dominance over Byzantine territories along the lower Danube in the 600s C.E. The Balkans, previously Thraco-Romanized in language and culture, became predominantly Slavonic-speaking — a shift that defined the region’s character for the next 1,500 years.

The fall of Rome — and what took its place

In 476 C.E., a Germanic commander named Odoacer deposed Romulus Augustulus, the last emperor of the Western Roman Empire. Historians once treated that moment as a catastrophic ending. The picture is considerably more complicated.

The Eastern Roman Empire — what we now call the Byzantine Empire — adapted, survived, and continued to function until the fall of Constantinople in 1453 C.E. The Western collapse was, in significant ways, managed rather than simply suffered: Eastern emperors played active roles in negotiating which groups took which territories. The “barbarian” leaders who replaced Roman governors often preserved Roman law, infrastructure, and administrative practices, because those systems worked and their people depended on them.

The Frankish kingdom was the clearest example. Clovis converted to Christianity, allied with the Church, and built a state that drew heavily on Roman legal and administrative frameworks. The continuity was as significant as the rupture.

Lasting impact

The Migration Period produced the ethnic, linguistic, and political map of Europe that persisted — in broad outline — into the modern era. The boundaries of France, Germany, England, Spain, and the Slavic nations of Eastern Europe are all, in part, products of where peoples settled during these two centuries.

The spread of Slavic languages across Eastern Europe during this period gave rise to the family of languages now spoken by more than 300 million people. The Frankish kingdom’s fusion of Germanic culture and Roman institutional memory became the seed of the Carolingian Empire and, eventually, the concept of a unified Christian Europe.

The period also demonstrated something that would recur throughout history: that migrations produce not just disruption but synthesis. The post-Roman kingdoms were not simply Roman or simply “barbarian.” They were new things — hybrid cultures, hybrid legal systems, hybrid identities — that drew on multiple traditions at once.

Languages mixed. Legal codes blended Roman and Germanic custom. The Catholic Church, which had been a Roman institution, became a vehicle for preserving Latin learning and connecting the new kingdoms to a shared cultural framework. Monastic communities across Ireland, Britain, and the Continent copied and transmitted texts that would otherwise have been lost.

Blindspots and limits

The historical record for this period is thin, fragmented, and written almost entirely by literate elites — mostly Roman or Romanized writers who viewed the migrations with fear or contempt. The inner lives, motivations, and experiences of the people who moved — families, farmers, craftspeople, enslaved people — are largely invisible to us.

The period also involved enormous violence, displacement, and suffering for settled populations across the empire. The disruption of trade networks, agricultural systems, and urban life had lasting costs that fell hardest on the poorest and least powerful. Scholarly debate continues about whether the population of Western Europe actually declined significantly in the centuries following the Western Roman collapse, and the evidence remains contested.

It is also worth being precise about what “migration” meant. Some movements were organized tribal relocations of entire communities. Others were military conquests. Archaeological and genetic research in recent decades has complicated older narratives that assumed large-scale population replacement, finding instead considerable continuity in local populations even where political and linguistic change was dramatic.

Read more

For more on this story, see: Wikipedia — Migration Period

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