Queen Cassiopeia boasted that she and her daughter Andromeda were even prettier than the sea nymphs. Furious Poseidon sent the monster Cetus to destroy their kingdom. An oracle told them the only way to save the kingdom was to sacrifice Andromeda. So she was chained to the rocks to await Cetus. Perseus riding on Pegasus, turned Cetus into stone using a medusa head and freed Andromeda. Poseidon, still mad at Cassiopeia, threw her into the sky, where she spe
