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 to have been formed of Medusa's blood spilled onto seaweed when Perseus laid down the petrifying head beside the shore during his short stay in Ethiopia where he saved and wed his future wife, the lovely princess Andromeda. Furthermore, the poisonous vipers of the Sahara, in the "Argonautica" 4.1515, Ovid's "Metamorphoses" 4.770 and Lucan's" Pharsalia" 9.820, were said to have grown from spilt drops of her blood. The blood of Medusa also spawned the Amphisbaena (a horned dragon-like creature with a snake-headed tail). Perseus then flew to Seriphos, where his mother was being forced into marriage with the king, Polydectes,