Mozaic of Medusa, the Gorgon. According to legend, the Gorgons were ugly monsters with staring eyes, and writhing snakes for hair. Their gaze was so terrifying that anyone who looked upon them immediately turned to stone. It was said that blood taken from the right side of one of the Gorgons had the power to revive the dead, while blood taken from the left would instanty kill any living thing. Two of the Gorgons, Stheno and Euryale, were immortal, but Medusa was not. In one of the more famous Greek myths, the hero Perseus, using polished shield to reflect her image, killed and beheaded her with help from Athena. When Medusa was beheaded, the winged horse Pegasus sprang from her headless neck. Athena later placed an image of Medusa's head on her armor. This mozaic is displayed in the Sparta Archaeological Museum.