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Andromeda is a northern constellation visible in the autumn and winter. King Cepheus and Queen Cassiopeia of Ethiopia were the parents of Andromeda. Cassiopeia was very proud, and she bragged that she was more beautiful than the Nereids, the water nymphs. The nymphs heard this and complained to Poseidon, God of the Seas. Poseidon created a monster, Cetus, to rise out of the water and prey on the people of Ethiopia. Cepheus wanted to save his people from this monster. However, an oracle told him that the only way he could save his people was to sacrifice his daughter to Cetus. Cepheus unhappily chained Andromeda to a rock along the shore to await her fate. At that time Perseus was flying past, wearing the winged shoes of Mercury. Perseus was on his way home after killing the Gorgon Medusa. He offered to save Andromeda only if Cepheus would allow Perseus to marry her. When Cetus came toward Andromeda, Perseus took Medusa’s head out of a bag and showed it to Cetus. Cetus was turned into a rock along the shore. Perseus and Andromeda were married and the people celebrated both the weding and the end of their terrible ordeal of fear. This myth is told with several variations. It is commemorated in the sky with the adjacent constellations of Cepheus, Cassiopeia, Perseus, Pegasus, and Cetus.