Cepheus lies between Cassiopeia and Draco. In the Northern Hemisphere, it is a circumpolar constellation, meaning it can be seen throughout the year. It is best viewed from August through January. In Greek mythology, Cepheus is Cassiopeia's husband and Andromeda's father. Cepheus ruled over the mythical land of Ethiopia. Cassiopeia is said to have insulted the Nereids (sea nymphs) by boasting that she was more beautiful than they. The Nereids appealed to Poseidon who then sent a giant whale (Cetus) to ravage the coast of King Cepheus' kingdom. Cassiopeia and Cepheus sought the help of the oracles, who told them to sacrifice their only daughter, Andromeda, to the whale. With great despair, they had Andromeda chained to the rock for the whale to find. However, at the last minute, Andromeda was saved by Perseus, the hero, on his way home from slaying Medusa. During Perseus' and Andromeda's wedding, Phineus (Cepheus' brother) claimed that Andromeda was promised to him first. Perseus objected to this claim and a fight broke out. Being outnumbered, Perseus had to resort to using the head of Medusa to slay his opponents. However, Cassiopeia and Cepheus were also caught in Medusa's gaze and were turned to stone as well. Poseidon is said to have placed both Cassiopeia and Cepheus amongst the stars.