|Form: Gr. Kallisto.
|A nymph, the daughter of the Arcadian Lycaon, and a companion of Artemis. She became, by Zeus, the mother of Arcas, the ancestor of the Arcadians. She was'turned into a bear, according to one account by the jealous Hera, according to another by Zeus, who was anxious to protect her from Hera's wrath. In this shape she was slain by Artemis, and set among the constellations by Zeus under the title of the She-Bear. There was another story, according to which Callisto's son was intending to slay his transformed mother while hunting; upon which Zeus set him in the sky under the name of Arcturus (Arktouros), the Watcher of the Bear, and his mother under the name of Arctus (Arktos), the She-Bear. As the stars bearing these names never set, Homer describes them as the only ones which have no share in the bath of the ocean. Later poets, accordingly, invented the further story that Tethys, wishing to gratify Hera, refused to receive her former rival into her waters.