1. The last and at the same time the least important among the ten Attic orators, was born at Corinth about B. C. 361. (Dionys. Deinarch. 4.) His father's name was Sostratus, or, according to Suidas (s. v. *Dei/narxos), Socrates. Though a native of Corinth, he lived at Athens from his early youth. Public oratory there reached its height about this tine, and Deinarchus devoted himself to the study of it with great zeal under the guidance of Theophrastus, though he also profited much by his intercourse with Demetrius Phalereus. (Dionys. l.c. 2; Plut. Vit. X Orat. p. 850; Phot. Bibl. p. 496, ed. Bekker; Suidas, l.c.) As he was a foreigner, and did not possess the Athenian franchise, he was not allowed to come forward himself as an orator on the great questions which then divided public opinion at Athens, and he was therefore obliged to content himself with writing orations for others.
He appears to have commenced this career in his twenty-sixth year, about B.