sentence: The Ostrogoths , a Gothic tribe , settled in Roman Italy in the late fifth century under Theoderic the Great -LRB- d. 526 -RRB- and set up a kingdom marked by its co-operation between the Italians and the Ostrogoths , at least until the last years of Theodoric 's reign .
question: when did someone reign _ _ _ ?
answers: the late fifth century