She is the very beautiful and very vain Queen of Ethiopia (Philistia). Gazing at herself in a mirror, she proclaimed to be more beautiful than the Nereids, which were sea nymphs. As punishment Poseiden demanded that the princess Andromeda be sacrificed to the sea monster, Cetus. After her daughter was saved by Perseus, Cassiopeia plotted with her daughter's ex-fiancée Agenor to kill Perseus. Perseus used the Medusa's head to turn Cassiopeia, Agenor, and his men to stone.

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1. She is the very beautiful and very vain Queen of Ethiopia (Philistia). Gazing at herself in a mirror, she proclaimed to be more beautiful than the Nereids, which were sea nymphs. As punishment Poseiden demanded that the princess Andromeda be sacrificed to the sea monster, Cetus. After her daughter was saved by Perseus, Cassiopeia plotted with her daughter's ex-fiancée Agenor to kill Perseus. Perseus used the Medusa's head to turn Cassiopeia, Agenor, and his men to stone.