an academic philosopher of Athens, flourished in the century preceding the Christian sera. He quitted the Greek capital on the success of the army of Mithridates, and went to Rome, where he had Cicero for a disciple. He gained renown by his services to philosophic science. He furnished a more complete and systematic division of the different branches of philosophy, and was more methodic in his terms. He is also often spoken of as the founder of the third academy. See Tennemann, Manual of Hist. of Philosophy; Ueberweg, Hist. of Philosophy (see Index in volume 2).