 During the late Roman Empire, Pannonia Prima province was part of larger administrative units, such are Diocese of Pannonia, Praetorian prefecture of Illyricum and Praetorian prefecture of Italy.The first Germanic people to settle in this region were the Ostrogoths, who came to Pannonia in AD 380.The Ostrogoths became allies of Rome and were allowed to settle in Pannonia, being tasked to defend the Roman borders.