Greek: Μέδουσα (Méousa),protect, rule over".), a sea nymph, was one of three gorgon sisters, and the most beautiful. She was courted by Poseidon, and made love to him in a temple of Athena. Furious, Athena transformed Medusa into a monstrous chthonic beast with snakes instead of hair, whose frightening face could turn onlookers to stone. She was beheaded while sleeping by the hero Perseus, who thereafter used her head as a weapon until giving it to the goddess Athena to place on her shield. Having coupled with Poseidon previously, two beings sprang from her body when she was beheaded. One, Pegasus, was a winged horse later tamed by Bellerophon to help him kill the chimera. The other, Chrysaor of the Golden Sword, remains relatively unknown today. In classical antiquity and today, the image of the head of Medusa finds expression in the evil-averting device known as the Gorgoneion.