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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).
Hippocrates traveled throughout Greece practicing his medicine. He founded a medical school on the island of Kos, Greece and began teaching his ideas. He soon developed an Oath of Medical Ethics for physicians to follow. This Oath is taken by physicians today as they begin their medical practice. He died in 377 BC. Today Hippocrates is known as the Father of Medicine.