Perseus and Andromeda (Titian) was ruled by the beautiful but vain queen, Cassiope; she maintained that her beauty, and that of her daughter Andromeda, was superior to that of the sea nymphs, who were the 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 Cetus or sea monster to ravage the coastline of Ethiopia placing Cassiope's kingdom at risk. On the advice of Jupiter Ammon, the Queen, together with her husband Cepheus, decided to sacrifice her daughter Andromeda to the monster. Perseus, flying back from his
Sea monster and caudal fins first, making them resemble a plesiosaur. Sea monsters actually reported first or second hand include Sea monster Sea monsters are beings from folklore believed to dwell in the sea and often imagined to be of immense size. Marine monsters can take many forms, including sea dragons, sea serpents, or multi-armed beasts. They can be slimy and scaly and are often pictured threatening ships or spouting jets of water. The definition of a "monster" is subjective, and some sea monsters may have been based on scientifically accepted creatures such as whales and types of giant and colossal squid.