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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).
á¸¤unayn was a Nestorian Christian who studied medicine in Baghdad and became well versed in ancient Greek. He was appointed by Caliph al-Mutawakkil to the post of chief physician to the court, a position that he held for the rest of his life.