dĭo or -ōn, ōnis, m., = Δίων.
I A brother-in-law of the elder Dionysius, of Syracuse, the pupil and friend of Plato . His life was written by Nepos and Plutarch; cf. also Cic. Tusc. 5, 35; id. de Or. 3, 34; Jornand. 2, 92.—
II An Academic philosopher , Cic. Ac. 2 ( Luc. ), 4, 12.—
III A Stoic philosopher , Cic. Leg. 3, 5 fin. dub. (al. Diogenes).—
IV Dio Halaesinus, Cic. Verr. 2, 1, 10 al.