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, 4, 12.
- III. A Stoic philosopher, Cic. Leg. 3, 5 fin. dub. (al. Diogenes).
- IV. Dio Halaesinus, Cic. Verr. 2, 1, 10 al.