Andromeda

Piero di Cosimo, Perseus Freeing Andromeda, 1510 or 1513, oil on canvas, 70 x 123 cm, Galleria degli Uffizi, Florence

Andromeda was the daughter of Cassiopeia, who boasted that her daughter was more beautiful than the Nereids.  Angered, Poseidon/Neptune had her stripped and chained to a rock, and sent a sea monster to kill her.  She was rescued, however, by Perseus.