Migration Period

Lore & Background

The Migration Period began with the invasion of Europe by the Huns from Asia in about 375, though some historians extend the period from as early as 300 to as late as 800. The first wave of invasions, between AD 300 and 500, saw Germanic peoples gain control of most areas of the Western Roman Empire. The Tervingi crossed the Danube in 376 fleeing the Huns, and after a rebellion sparked by the killing of their leader Fritigern's escort at Marcianopolis, the Visigoths sacked Rome in 410 and later founded the Visigothic Kingdom in Iberia around 460. The Franks gradually entered Roman Gaul and, after consolidating power under Childeric and his son Clovis's decisive victory over Syagrius in 486, established themselves as rulers of northern Roman Gaul, fending off Alemanni, Burgundians, and Visigoths.

Reader's Guide

The Migration Period is significant as it directly led to the fall of the Western Roman Empire and the establishment of post-Roman kingdoms across Europe. Historians debate whether increased migrations caused the empire's collapse or if internal breakdown and reliance on non-Roman military created additional factors. The period saw the movement of hundreds of thousands of people, with estimates for individual groups ranging from war bands of a few thousand to tribal groups over 100,000. The Gothic crossing of the Danube in 376 brought 90,000–200,000 people; the Rhine crossing of 406 involved up to 200,000; and the Ostrogothic invasion of Italy in 489 numbered 100,000–200,000. The Anglo-Saxon migration to Britain ranged from 20,000 to 200,000, and the Lombard invasion of Italy in 568 was estimated at around 150,000. The Eastern Roman Empire adapted and continued until the fall of Constantinople to the Ottomans in 1453, while the Western Empire's fall was partly managed by Eastern emperors. Later invasions by Vikings, Normans, Hungarians, Arabs, Turks, and Mongols also affected former Roman territories.

Did You Know?

• The Gothic crossing of the Danube in 376 brought an estimated 90,000–200,000 people into the Empire.
• The Rhine crossing of 406 involved a coalition of Vandals, Alans, and Suebi estimated at up to 200,000 people.
• The Lombard invasion of Italy in 568 has been estimated at around 150,000 people.
• The term 'Völkerwanderung' was first introduced by Michael Schmidt in his 1778 history of the Germans.
• The Eastern Roman Empire adapted and continued to exist until the fall of Constantinople to the Ottomans in 1453.

The Vast Human Movement Behind the Name

The Migration Period was not a single event but a prolonged, multi-generational reshuffling of populations across the European continent. Between roughly 300 and 600 AD, an extraordinary variety of peoples—Germanic tribes like the Goths, Vandals, Franks, and Burgundians, alongside the Huns, Alans, early Slavs, Pannonian Avars, Bulgars, and Magyars—moved into or through the territories of the Western Roman Empire. The scale was staggering. Modern estimates place the Gothic crossing of the Danube in 376 at between 90,000 and 200,000 individuals. The coalition of Vandals, Alans, and Suebi that breached the Rhine in 406 may have numbered as many as 200,000. The Ostrogothic force under Theodoric that entered Italy in 489 is estimated at 100,000 to 200,000, while the Lombard invasion of 568 brought roughly 150,000. Taken together, total migration into Roman territory during this era could have ranged from half a million to well over a million people, a demographic upheaval that permanently altered the political and cultural landscape of Europe.

The Unraveling of Western Roman Power

The collapse of centralized authority in the West did not happen overnight, nor was it caused by a single factor. As the fourth and fifth centuries progressed, the Roman state increasingly relied on non-Roman soldiers and allied peoples to hold its borders. The Goths were settled as foederati in the Roman Balkans, and the Franks were established south of the Rhine in Roman Gaul—arrangements that blurred the line between citizen and outsider. When the Huns surged westward from Asia around 375, they triggered a chain reaction of displacement that no single Roman garrison could contain. The unexpected Rhine crossing of 406, in which Vandals, Alans, and Suebi swept across the frozen river, exposed just how fragile the frontier had become. By the time Odoacer's mixed force of Herulian, Rugian, and Scirian warriors deposed the last Western emperor, Romulus Augustulus, in 476, the military apparatus of the West was already dominated by men of barbarian origin. The Eastern emperors, who would keep their state alive until the Ottoman conquest of Constantinople in 1453, played a role in managing the transition, yet the Western provinces were left to be carved into competing post-Roman kingdoms.

Pivotal Moments That Redrew the Map

Several dramatic episodes punctuated the Migration Period and left lasting marks on European history. In 376, the Tervingi crossed the Danube into Roman territory, fleeing the advance of the Huns. Tensions soon erupted at Marcianopolis, where the escort of their leader Fritigern was killed during a meeting with the Roman commander Lupicinus, sparking a rebellion. The Visigoths, a group derived from or fused with the Tervingi, went on to sack Rome in 410—a shockwave that reverberated through the ancient world. Around 460 they established their kingdom in the Iberian Peninsula. In Gaul, the Franks consolidated their hold after Clovis's decisive victory over the Roman general Syagrius in 486, fending off Alemanni, Burgundian, and Visigothic rivals to build the foundation of what would become France and Germany. In Italy, the Ostrogoths under Theodoric the Great settled in 489, and the Lombards followed with their conquest in 568, an event traditionally marked as the closing point of the Migration Period.

From Wandering Tribes to Lasting Kingdoms

The Migration Period was not merely a story of destruction; it was a process of political and cultural formation. Before the great invasions, Germanic peoples had already been moving for centuries, expanding out of southern Scandinavia and northern Germany after 1000 BC, pushing Celtic populations westward toward the Rhine by around 200 BC. A later wave between 600 and 300 BC carried groups eastward along the Baltic coast. During the era of the Roman historian Tacitus, smaller tribes such as the Tencteri, Cherusci, Hermunduri, and Chatti existed, but a period of federation and intermarriage gradually produced the larger, more recognizable polities of the Alemanni, Franks, Saxons, Frisians, and Thuringians. The migrations of the fourth through sixth centuries then transformed these groups into rulers of territory. The Frankish kingdom, the Visigothic realm in Iberia, and the Ostrogothic settlement in Italy each became enduring political entities. Even the Anglo-Saxon movement to Britain, estimated at anywhere from 20,000 to 200,000 people, reshaped the island's linguistic and political identity for centuries to come.