Orestes ōrĕst´ēz [key], d. 476, Roman general. With the help of barbarians he deposed (475) the Roman emperor of the West, Julius Nepos, and raised his own son, Romulus Augustulus , to the throne. The next year the barbarians under Odoacer revolted; Orestes was killed at Piacenza, and his son was deposed.

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