(Γνήσιππος), the son of Cleomachus, a Dorian lyric poet, according to Meineke, whose light and licentious love verses were attacked by Chionides, Cratinus, and Eupolis. The passages quoted by Athenaeus seem, however, to bear out fully the opinion of Welcker, that Gnesippus was a tragic poet, and that the description of his poetry given by Athenaeus (παιγνιαγράφου τῆς ἱλαρᾶς μούσης) refers to his choral odes. (Athen. 14.638d. e.; Meineke. Frag. Com. Graec. vol. ii. pp. 7, 27-29; Welcker, die Griech. Trag. vol. iii. pp. 1024-1029.)
[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