 During the Migrations Period in the 5th century, some parts of Pannonia was ceded to the Huns in 433 by Flavius Aetius, the magister militum of the Western Roman Empire.After the collapse of the Hunnic empire in 454, large numbers of Ostrogoths were settled by Marcian in the province as foederati.The Eastern Roman Empire controlled it for a time in the 6th century, and a Byzantine province of Pannonia with its capital at Sirmium was temporarily restored, but it included only a small southeastern part of historical Pannonia.