Zeus became the king of the gods after overthrowing his father Cronus, who had swallowed Zeus and his siblings out of fear of being overthrown himself. Poseidon is Zeus's brother and the god of the seas, said to have created horses. Several dangerous mythical creatures are also mentioned, including the Hydra whose heads would regrow unless burned, the sea monster Scylla who was once a beautiful nymph but transformed, and the Minotaur, a half-man half-bull beast that ate people.