[3] Cassiopeia boasted that she (or her daughter Andromeda), was more beautiful than all the Nereids, the nymph-daughters of the sea god Nereus.[4] Accounts differ as to whether Poseidon decided to flood the whole country[5] or direct the sea monster Cetus to destroy it.In either case, trying to save their kingdom, Cepheus and Cassiopeia consulted a wise oracle, who told them that the only way to appease the sea gods was to sacrifice their daughter.[5] Poseidon thought Cassiopeia should not escape punishment, so he placed her in the heavens chained to a throne in a position that referenced Andromeda's ordeal.The constellation is also visible in countries north of the Tropic of Capricorn, in late spring.