Proper noun
Ostrogothic Kingdom
(historical) A kingdom (493—553 CE), founded by Theodoric the Great, corresponding to present-day Italy (including Sicily but not Sardinia) and neighbouring areas.
Erik Durschmied, From Armageddon to the Fall of Rome, Ch. 17 With the fall of the western part of the Roman Empire, Italy was taken over by the Ostrogoths and became part of the Ostrogothic Kingdom in the late fifth century. Source: Internet