Κασσιόπη
Cassiopeia’s story originated in the mythology of ancient Greece. Cassiopeia was the queen and consort of King Cepheus in Ethiopia. Their daughter Andromeda was very beautiful. Cassiopeia herself was a great beauty and was vain of it; she proclaimed her beauty was greater than that of the Nereids', the daughters of the sea god Poseidon. To punish Cassiopeia, he sentenced Andromeda to be tied to a rock with a sea monster awaiting her.
Perseus, returning from having slaughtered the gorgon Medusa, encountered Andromeda lashed to the rock. He spoke to Cassiopeia and her husband and struck a deal with them: he would be allowed to marry Andromeda if he could kill the great sea monster before it killed their virgin daughter. Perseus defeated the monster, took Andromeda and returned to Ethiopia.[1] Cassiopeia and Cepheus fulfilled their end of the bargain and began to plan the wedding for Andromeda. After the nuptials began, Phineus entered the proceedings and demanded his right to marry Andromeda.
A battle ensued in which Cepheus and Cassiopeia sided with Phineus. Outnumbered, Perseus considered that he had no choice but to slay his challengers by using the head of the recently slaughtered Medusa. Following their death both Cepheus and Cassiopeia were placed among the stars by Poseidon. Cassiopeia was put upside down for half the year because of her vanity, with her husband beside her.