The early Anglo-Saxon period covers the history of medieval Britain that starts from the end of Roman rule. It is a period widely known in European history as the Migration Period, also the Völkerwanderung ("migration of peoples" in German). This was a period of intensified human migration in Europe from about 375 to 800. The migrants were Germanic tribes such as the Goths, Vandals, Angles, Saxons, Lombards, Suebi, Frisii, and Franks; they were later pushed westwards by the Huns, Avars, Slavs, Bulgars, and Alans. The migrants to Britain might also have included the Huns and Rugini. Until AD 400, Roman Britain, the province of Britannia, was an integral, flourishing part of the Western Roman Empire, occasionally disturbed by internal rebellions or barbarian attacks, which were subdued or repelled by the large contingent of imperial troops stationed in the province. By 410, however, the imperial forces had been withdrawn to deal with crises in other parts of the empire, and the Romano-Britons were left to fend for themselves in what is called the post-Roman or "sub-Roman" period of the 5th century.