For 10 points, name this mother of Andromeda.
The son of one woman of this name was a Trojan warrior loved by Sarpedon and named Atymnius. In addition to King Phoenix's wife, the more famous figure of this name was associated with both a crown and a throne, as she was upside-down for half of eternity. Some accounts say that her country was destroyed by a flood, but all accounts agree that her words upset the fifty daughters of Doris and Nereus, resulting more famously in the whale-like Cetus ravaging the shores of Ethiopia. After consulting an oracle with her husband Cepheus, this figure chained up her daughter as a sacrifice to the sea monster. For 10 points, name this mother of Andromeda.
The son of one woman of this name was a Trojan warrior loved by Sarpedon and named Atymnius.
Cassiopeia