Andromeda was the daughter of Cepheus, king of Ethiopia, & Cassiopeia. Her mother claimed that she was more beautiful than all the Nereids, sea deities & granddaughters of the ocean. Jealous, the Nereids asked Poseidon to avenge them. The latter sent the monster Ketus to ravage the kingdom of Cepheus. Warned by an oracle that the only way to appease the god of the sea was to sacrifice their daughter, the king & queen tied her to a rock by the water. Perseus, son of Zeus & Danae, fell in love with the girl & made her parents promise to give her his hand if he delivered them from the monster. Diving from the top of the clouds with his winged sandals, he killed the monster, freed Andromeda & married her.