The trial and condemnation of Socrates (469-399 B.C.) is one of the most tragic episodes in the history of Athens' decline. Plato, Socrates' most devoted disciple, has preserved for us the essence of the teaching and logical system of question-and-answer of western civilization's purest intellect in this sequence of four works: Euthyphro, The Apology, Crito, and Phaedo.