In the fifth century BC professional educators, the sophists, travelled the Greek world claiming to teach success in public and private life. In this dialogue Plato shows the pretensions of the leading sophist, Protagoras, challenged by the critical arguments of Socrates. From criticism of the educational aims and methods of the sophists the dialogue broadens out to consider the nature of the good life, and the role of pleasure and intellect in the context of that life.

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