Cassiopeia

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Cassiopeia is a queen of Greek mythology — wife of Cepheus, king of the land the Greeks called Aethiopia, and mother of Andromeda — remembered for a boast that cost her almost everything and for the constellation that carries her name. The story is brief and durable: she claimed that her beauty, or her daughter’s, surpassed that of the Nereids, the sea-nymphs of the deep. The claim reached them, and they were not flattered.

What the sources relate runs the same way in each telling. Poseidon, taking the nymphs’ part, sent a flood and a sea monster against the coast; the kingdom, ruined, consulted an oracle, which answered that only the sacrifice of Andromeda would lift the affliction. The princess was chained to a rock at the water’s edge to be devoured. Perseus, passing overhead with the head of Medusa, saw her, struck a bargain for her hand, and killed the monster — so that Cassiopeia’s pride is the hinge on which one of the best-known of all Greek rescue tales turns. The fullest ancient accounts are late and literary: the mythographer Apollodorus and, in verse, Ovid; the constellation lore comes chiefly from the handbooks of Aratus and Hyginus.

The punishment did not end with the rescue. Cassiopeia was placed among the stars, and there she remains — but the gods arranged the honor so that it stings. Her constellation, a bright W or M near the celestial pole, wheels around it without ever setting, and for part of each night she hangs head-downward, the queen on her throne tipped over in full view of the sky she once thought to rival. Ancient writers read this as the design of the offended nymphs: vanity fixed in the heavens and made permanently ridiculous.

The constellation is older than the surviving stories that explain it. It is one of the forty-eight figures catalogued by Ptolemy in the second century, drawn from a Greek sky-map that was already traditional, and the named characters of the Perseus legend — Cepheus, Cassiopeia, Andromeda, Perseus, the monster Cetus — sit together in that region of the heavens as a single linked tableau. Whether the myth was told to explain the star-pattern or the pattern named after an existing tale is the kind of question the ancient evidence does not settle; both directions of influence are visible in the record. What is clear is that the sky-figure and the story have been read as one thing for a very long time, each lending the other its weight.

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