Antisthenes, an Athenian philosopher of the fourth century B.C. He was a pupil of Socrates, for whom he deserted the sophist Gorgias. He is said to have avenged his master's execution by compassing the death of Melitus and the banishment of Anytus. The Cynic school was founded by him, and he insisted that virtue was the only thing worth pursuing. According to tradition, Socrates declared that, his pride showed itself through the holes in his raiment.