(Γηρυόνης), or GERY'ONES, a son of Chrysaor and Calirrhoe, a fabulous king of Hesperia, who is described as a being with three heads, and possessing magnificent oxen in the island of Erytheia. He acts a prominent part in the stories of Heracles. (Apollod. 2.5.10; comp. HERACLES.)
[L.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