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In Greek mythology, Cassiopeia was the beautiful and vain wife of Cepheus, an Ethiopian king. Cepheus and Cassiopeia had a daughter, Andromeda, who was to be wed to the hero Perseus. Cassiopeia, at the last minute, decided to promise Andromeda to Agenor, a son of Poseidon.
Agenor arrived at the nuptials with an army, intending to kill Perseus and take Andromeda for himself. If you remember, Perseus is the guy who slayed the Gorgon. As Agenor’s army approached, Perseus retrieved the Medusa’s head and turned the army, including Cassiopeia, into stone. Poseidon decided to place Cassiopeia, along with Cepheus, in the heavens as constellations. However, as punishment for her vanity he placed her in the night sky sitting in a chair that revolved around the North Star so that she would spend half of all eternity upside down.
