Perseus and Andromeda (Leighton) daughters of Poseidon, the god of the sea. When the nymphs became aware of her claims, they protested to their father, who retaliated by calling up a sea monster called Cetus to patrol and wreak havoc along the coastline of Ethiopia placing Cassiope's kingdom at risk. In response the Queen, together with her husband Cepheus, decided to sacrifice her daughter, Princess Andromeda, to the monster. Andromeda was chained to a rock at the edge of the sea as an offering to the monster. Perseus was travelling back home on his winged horse, Pegasus, after battling with Medusa. He rescued Andromeda
Medusa (DC Comics) sisters Euryale and Stheno. She eventually met the gaze of Poseidon. Athena took notice of this, and cursed Medusa, transforming her hair into snakes and giving her a deadly gaze that turns any who look into her eyes to stone. The hero Perseus was given the task of slaying Medusa and taking her head. After using her decapitated head for his own use, Perseus threw it into the sea as he believed it too dangerous to keep. At some point before Medusa's death, she mated with the cyclops Polyphemus and gave birth to the serpentine giant Cyclon. The god of