History of Cassiopeia
It is the queen of Ethiopia, wife of Cepheus, who boasted of being more beautiful than all the Nereids, nymphs of the sea. They asked for the revenge of Neptune, king of the seas, who then sent a sea monster devastating the kingdom of Cepheus. To appease him, Cassiopeia had to sacrifice his daughter Andromeda. After Perseus saved her, Cassiopeia opposed their marriage and Perseus, showing off the head of the Medusa, petrified her. Banished, Cassiopeia is exiled in the sky in order to be upside down half the time to teach her humility.