Theopompus thēˌōpŏmˈpəs [key], fl. 4th cent. b.c., Greek historian and rhetorician, b. Chios. He studied with the orator Isocrates and became a friend of both Philip and Alexander of Macedon. His pro-Macedonian sympathies often caused trouble with his fellow Greeks. He wrote the Hellenica, a history of Greece from 411 b.c. to 394 b.c., and the Philippica, a discursive chronicle of Philip's life.

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