Cassiopeia
2 of the 7 encyclopedias on this shelf carry an entry for Cassiopeia. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
kas-i-o-pe'ya, in Grecian mythology, an Ethiopean queen, wife of Cepheus and mother of Andromeda. Cassiopeia was so proud of her daughter's beauty that she boasted that it surpassed that of the Nereids or sea-nymphs. The incensed nymphs begged Poseidon for vengeance. In response to their prayer a deluge laid waste the dominions of Cepheus, and a fearful monster appeared on the coast to still further ravage the country. Cepheus, inquiring of the oracle, learned that only the sacrifice of the beautiful Andromeda would appease the wrath of the ocean dwellers. Andromeda, therefore, was chained to a rock on the seacoast to be devoured by the monster. While awaiting, her horrible fate, she was seen by Perseus, flying homeward with Hermes' winged shoes, and carrying Medusa's head. Perseus dropped to earth, learned the troubles of Andromeda, slew the monster, and married the maiden. For a time the sea nymphs ceased to harass Cassiopeia. At her death, however, she was given a place among the stars, which angered them anew. Their only recourse was to cause her position in the heavens to be such that in revolving about the pole star , she should hang head downward half the time. This, perhaps, to teach her humility. The constellation Cassiopeia is known as the Lady in her Chair. In charts of the constellations she is represented as a draped figure reclining in a chair and holding up both arms. There are fifty-five stars in the constellation, five of which, forming a capital W, are of the third magnitude. A new star appeared in the constellation in 1572. For a time it shone as brightly as Venus, then disappeared, and has not been identified since. That starred Ethiope Queen that strove To set her beauty's praise above The sea-nymphs, and their powers offended. --Milton.
Collier's New Encyclopedia (1921)
or CASSIEPEIA, (1) the wife of Cepheus, King of Æthiopia, and mother of Andromeda. (2) "The Lady in her Chair," one of the northern circumpolar constellations included in Ptolemy's original 48. The figure is that of a woman seated in a chair and turning backward round the pole of the heavens. The constellation is bounded by Cepheus, Camelopardalis, Perseus, Andromeda, and Lacerta. It is in this con- He stellation that the Nova ( Lat. " new ") wonderful of 1572, or Tycho Brahe's of star, burst forth in November of that year.