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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).
Sophocles sets the scene many years after Oedipus came to Thebes, when he has been married to Jocasta for many years and sired four children, Antigone, Ismene, Polynices and Eteocles. A plague has struck Thebes and a Priest begs Oedipus, the most cunning and intelligent of all men, to find a solution.