Mythology & Beliefs: Diomedes In Greek and Roman Mythology, Diomedes was the owner of man-eating
horses, which Hercules, as ninth labor, carried off.
Diomedes in Greek and Roman Biography and Mythology
3. A son of Ares and Cyrene, was king of the Bistones in
Thrace, and was killed by Heracles on account of his mares,
which he fed with human flesh. (Apollod. 2.5.8; Diod. 4.15;
Serv. ad Aen. 1.756.) Hyginus (Hyg. Fab. 250) calls him a son
of Atlas by his own daughter Asteria. - A
Dictionary of Greek and Roman biography and mythology,
William Smith, Ed.