Andromeda is the daughter of Cepheus - an Aethiopian king - and Cassiopeia. When Cassiopeia's hubris leads her to boast that Andromeda is more beautiful than the Neireids, Poseidon sends a sea monster to ravage Aethiopia. Andromeda is chained to a rock as a sacrifice to sate the monster, but is saved from death by Perseus, her future husband. O. How I love Greek mythology.