(Λεύκων), the son of Hagnon, according to Toup's emendation of Suidas (s. v.), an Athenian comic poet, of the old comedy, was a contemporary and rival of Aristophanes. In B. C. 422 he contended, with his Πρέσβεις, against the Wasps of Aristophanes, and in the following year, with his Φράτερες, against the Peace of Aristophanes, and the κόλακες of Eupolis; on both occasions he obtained the third place (Didasc. ad Vesp. et Pac.) Suidas also mentions his Ὂνος ἀσκοφόρος The story on which this play was founded is explained by Böckh (Publ. Oecon. of Ath. p. 324, 2nd edit.).
No fragments of his plays survive. The title Φράτερες is usually corrupted into Φράτορες, but Meineke shows that the other is the true form. (Athen. 8.343. c.; Suid. s. v. Λεύκων; Hesych. s. v. Πάαπις; Phot. s. v. Τίβιοι; Meineke, Hist. Crit. Com. Graec. pp. 217, 218.)
[P.S]