The Visigoths were a Germanic people united under the rule of a king and living within the Roman Empire during late antiquity. The Visigoths first appeared in the Balkans, as a Roman-allied barbarian military group united under the command of Alaric I. Their exact origins are believed to have been diverse but they probably included many descendants of the Thervingi who had moved into the Roman Empire beginning in 376 and had played a major role in defeating the Romans at the Battle of Adrianople in 378. Relations between the Romans and Alaric's Visigoths varied, with the two groups making treaties when convenient, and warring with one another when not. Under Alaric, the Visigoths invaded Italy and sacked Rome in August 410.

Late antiquity is sometimes defined as spanning from the end of classical antiquity to the local start of the Middle Ages, from around the late 3rd century up to the 7th or 8th century in Europe and adjacent areas bordering the Mediterranean Basin depending on location. The popularisation of this periodization in English has generally been credited to historian Peter Brown, who proposed a period between 150–750 AD. The Oxford Centre for Late Antiquity defines it as "the period between approximately 250 and 750 AD". Precise boundaries for the period are a continuing matter of debate. In the West, its end was earlier, with the start of the Early Middle Ages typically placed in the 6th century, or even earlier on the edges of the Western Roman Empire.