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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).
Soranus said that Hippocrates learned medicine from his father and grandfather (Hippocrates I), and studied other subjects with Democritus and Gorgias. Hippocrates was probably trained at the asklepieion of Kos, and took lessons from the Thracian physician Herodicus of Selymbria.