a tragic poet, who is said to have begun to exhibit at Athens in B. C. 404. Of his tragedies only a few titles remain, namely, Θυέστης, Ἀχιλλεύς, Ἑλένη, Ἡρακλῆς, Μήδεια, Οίδίπους, Χρύσιππος, Σεμέλη; and it is remarkable that all of these, except the last, are ascribed by Diogenes Laertius to Diogenes the Cynic. (6.80, or 73.) Others ascribe them to Philiscus of Aegina, a friend of Diogenes the Cynic (Menagius, ad Diog. Laert. l.c.), and others to Pasiphaon. Melanthius in Plutarch (de Aud. Poet. 4, p. 41d.) complains of the obscurity of a certain Diogenes. Aelian (Ael. VH 3.30, N. A. 6.1) mentions a tragic poet Diogenes, who seems, however, to be a different person from either Diogenes the Cynic or Diogenes Oenomaüs. (Suid. s.v. Ath. xiv. p. 636a.; Fabric. Bibl. Graec. ii. p. 295.)
[P.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890