Theodoric, surnamed the Great, founder of the monarchy of the Ostro- or East Goths, son of Theodemir, the Ostrogothic king of Pannonia; was for ten years during his youth a hostage at the Byzantine Court at Constantinople; succeeded his father in 475, and immediately began to push the fortunes of the Ostrogoths; various territories fell into his hands, and alarm arose at the Imperial Court; in 493 advanced upon Italy, overthrew Odoacer, and after his murder became sole ruler; was now the most powerful of the Gothic kings, with an empire embracing Italy, Sicily, and Dalmatia, besides German possessions; as a ruler proved himself as wise as he was strong; became in after years one of the great heroes of German legend, and figures in the "Nibelungenlied" (455-526).