Sea god Poseidon was attracted towards Kaeneus stunning beauty and lusted after her. Kaeneus tried to escape Poseidon embraces, but Poseidon forced her to have sexual intercourse with him. Afterwards Poseidon promised to grant her anything she wished. Kaeneus wished to become a man, so that nothing like this could ever happen to her again. Poseidon granted her wish, and in addition, made her/him invulnerable to all weapons. Kaeneus then changed his name to Kaeneus and became a warrior, traveling all over Thessaly.