Perseus and Andromeda (Leighton) daughters of Poseidon, the god of the sea. When the nymphs became aware of her claims, they protested to their father, who retaliated by calling up a sea monster called Cetus to patrol and wreak havoc along the coastline of Ethiopia placing Cassiope's kingdom at risk. In response the Queen, together with her husband Cepheus, decided to sacrifice her daughter, Princess Andromeda, to the monster. Andromeda was chained to a rock at the edge of the sea as an offering to the monster. Perseus was travelling back home on his winged horse, Pegasus, after battling with Medusa. He rescued Andromeda
Perseus the only mortal Gorgon, Medusa, whose gaze turned people to stone. Ovid's account of Medusa's mortality tells that she had once been a woman, vain of her beautiful hair, who was raped by Poseidon in the Temple of Athena. In punishment for the desecration of her temple, Athena had changed Medusa's hair into hideous snakes "that she may alarm her surprised foes with terror". Athena instructed Perseus to find the Hesperides, who were entrusted with weapons needed to defeat the Gorgon. Following Athena's guidance, Perseus sought the Graeae, sisters of the Gorgons, to demand the whereabouts of the Hesperides, the