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Isocrates was an influential teacher, perhaps the most so in the ancient history of rhetoric. His students included many notable citizen statesmen and decorated leaders. Isocrates' school had entrance requirements (few others did in those days--other than the requisite tuition).
More on Isocrates from Perseus Project. Born, 436 BC; died (suicide by starvation) 338 BC (upset over Philip's victory) Isocrates was educated by Gorgias, Tisias, and Socrates, among others! He began his career as a logographer, writing speeches for others to deliver in the law courts.