There are so many tales of the vanity of kings and queens that the half of them cannot be told.
There was Cassiopaeia, queen of Aethiopia, who boasted that her beauty outshone the beauty of all the sea-nymphs, so that in anger they sent a horrible sea-serpent to ravage the coast. The king prayed of an Oracle to know how the monster might be appeased, and learned that he must offer up his own daughter, Andromeda. The maiden was therefore chained to a rock by the sea-side, and left to her fate. But who should come to rescue her but a certain young hero, Perseus, who was hastening homeward after a perilous adventure with the snaky-haired Gorgons. Filled with pity at the story of Andromeda, he waited for the dragon, met and slew him, and set the maiden free. As for the boastful queen, the gods forgave her, and at her death she was set among the stars. That story ended well.