4. Of Rhegium, sometimes mentioned merely as of Italy, wrote on the ancient poets and musicians (σύγγραμμά τι περὶ τῶν ἀρχαίων ποιητῶν τε καὶ μουσικῶν, Plut. de Music. 4, p. 1132e.). Diogenes Laertius quotes statements of his respecting Empedocles and Democritus, and says that he was contemporary with Democritus (8.52, 9.38). Glaucus is also quoted in the argument to the Persae of Aeschylus. (Γλαῦκος ἐν τοῖς περὶ Αἰσχύλου μύθων.) His work was also ascribed to the orator Antiphon. (Plut. Vit. X. Orat. p. 833d.)