The Protagoras, one of Plato's most brilliant dramatic masterpieces, presents a vivid picture of the crisis of fifth-century Greek thought, in which traditional values and conceptions of man were subjected both to the criticism of the Sophists and to the far more radical criticism of Socrates. The dialogue deals with many themes which are central to the ethical theories which Plato developed under the influence of Socrates, notably the nature of human excellence, the relation of knowledge to right conduct, and the place of pleasure in the good life. This translation of the Protagoras was originally published in 1976. In this revised edition, C. C. W. Taylor has made a number of changes in the Translation and Commentary, and has added a new Preface and Introduction. The Bibliography has also been extended to include titles published up to 1990.