In Greek mythology, Lycus (/ˈlaɪkəs/ LY-kəs; Ancient Greek: Λύκος, romanized: Lúkos, lit. 'wolf'), also called Lycaon,[1] was a son of Poseidon and Celaeno, one of the Pleiades. Together with his brother Eurypylus, they ruled over the Isles of the Fortunate which their father blessed.[2]