 Tyro was married to King Cretheus of Iolcus, with whom she had three sons, Aeson, Pherês, and Amythaon, but she loved Enipeus, a river god.She pursued Enipeus, who refused her advances.One day, Poseidon, filled with lust for Tyro, disguised himself as Enipeus and lay with her - from their union were born twin sons, Pelias and Neleus.