In ancient Greek mythology, the beautiful and vain Queen Cassiopeia angered Poseidon, god of the sea, by gloating that she and her daughter Andromeda were more beautiful than the daughters of another sea god, Nereus. Andromeda was rescued from punishment by the great hero Perseus, but Cassiopeia was not so lucky. Sent to the sky by Poseidon, Cassiopeia is chained to a throne and is visible year-round in Iowa near the North Star.