(Ἀρισταῖος), the son of Damophon, of Croton, a Pythagoraean philosopher, who succeeded Pythagoras as head of the school, and married his widow Theano. (Iambl.100.36.) He was the author of several mathematical works, which Euclid used. (Pappus, lib. vii. Mathem. Coll. init.) Stobaeus has given (Ecl. 1.6, p. 429, ed. Heeren) an extract from a work on Harmony (Πεὶ Ἁρμονίας), by Aristaeon, who may be the same as this Aristaeus. (Fabric. Bibl. Graec. i. p. 836.)