Cassiopeia was the vain mother of Andromeda in Greek mythology. She bragged that her daughter was more beautiful than the goddess Athena. Athena got mad and declared her daughter should be sacrificed, but Perseus saved her. All 3 of them, Andromeda, Cassiopeia, and Perseus are constellations. The name comes from either kassiepeia meaning "cassia juice" or kassiopi meaning "she whose words excel."See Also: Cassia, Andromeda