Diophantus
2. An Attic orator and contemporary of Demosthenes, with whom he opposed the Macedonian party. He is mentioned as one of the most eminent speakers of the time. (Dem. de Fals. Leg. pp. 368, 403, 436, c. Lept. p. 498; Harpocrat. and Suid. s. v. Μελάνωπος.) Reiske, in the Index to Demosthenes, believes him to be the same as the author of the psephisma mentioned by Demosthenes (de Fals. Leg. p. 368), and also identical with the one who, according to Diodorus (16.48), assisted the king of Persia in his Egyptian war, in B. C. 350.
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.