The constellation of Cepheus, Cassiopeia’s husband, is easy to find because it is near the North Star and its five stars form the shape of a house with a steep roof.
Andromeda was rescued from Cetus by Persus, who wanted to marry her. As she had already been promised to a man called Phineus, a fight broke out. Perseus ended the dispute by pulling out the Gorgon Medusa’s head from his bag. This turned Phineus to stone, leaving Persus free to marry Andromeda.
As a punishment for her treachery, her constellation is supposed to represent Cassiopeia either chained to her throne (in an ironic reference to her daughter's ordeal) or stuffed into a basket
While combing her hair one day, Cassiopeia boasted to the 50 Nereids, who were beautiful, immortal sea nymphs, that she and her daughter, Andromeda, were more beautiful than they were. Angered by Cassiopeia’s arrogance, the Nereids looked to Poseidon, the god of the sea, to punish the mortal. Poseidon struck his trident into the water, causing the flood. Then he summoned up a sea monster, Cetus, to ravage the coastline. An oracle told Cephues, Cassiopeia’s husband, that the only thing that could stop Cetus's attacks was to sacrifice his daughter Andromeda to the sea monster. Then in punishment fir her vanity, Cassiopeia was placed in the heavens by Poseidon as a constellation that would sometimes appear upside down.
Alpha Cassiopeiae (Schedar), Beta Cassiopeiae (Caph), Gamma Cassiopeiae
Delta Cassiopeiae (Ruchbah), Epsilon Cassiopeiae (Segin), Eta Cassiopeiae (Achird)
Zeta Cassiopeiae, Rho Cassiopeiae, V509 Cassiopeiae