3. A Pythagorean, contemporary with Lysis, the teacher of Epaminondas, about B. C. 380. There is a letter from Lysis to Hipparchus, remonstrating with him for teaching in public, which was contrary to the injunctions of Pythagoras. (D. L. 8.42; Iambilich. Vit. Pythag. 17; Synes. Epist. ad Heracl.) Clemens Alexandrinus tells us, that on the ground of his teaching in public, Hipparchus was expelled from the society of the Pythagoreans, who erected a monument to him, as if he had been dead. (Strom. v. p. 574; comp. Lycurg. ad v. Leocr. 30.) Stobaeus (Serm. cvi.) has preserved a fragment from his book Περὶ εὐθυμίας. (Fabric. Bibl. Graec. vol. i. pp. 847, 886.)