In Greek mythology, Callisto was a nymph, or the daughter of King Lycaon; the myth varies in such details. She was believed to be one of the followers of Artemis who was pursued by Zeus. Many versions
Artemis (seated and wearing a radiate crown), the beautiful nymph Callisto (left), Eros and other nymphs. Antique fresco from Pompeii.
Titian's Diana and Callisto (1559) portrays the moment when Callisto's pregnancy is discovered.
Jupiter in the Guise of Diana Seducing Callisto, Jacob Adriaensz Backer, oil on canvas
Apulian Red-Figure Chous (Shape 3) with Kallisto Turning into a Bear, about 360 BCE, Terracotta, Attributed to Near the Black Fury Group (Greek (Apulian), active early 300s BCE), J. Paul Getty Museum
In Greek mythology, Arcas was a hunter who became king of Arcadia. He was remembered for having taught people the arts of weaving and baking bread and for spreading agriculture to Arcadia.
Callisto (mythology)
…when he was hunting, she was set among the stars as Ursa Major ("the Great Bear") by Zeus. She was the bear-mother of the Arcadians, through her son Arcas by Zeus. In other accounts, the birth mother of Arcas was called Megisto, daughter of Ceteus, son of Lycaon, or else Themisto, daughter of Inachus…
Arcas and Callisto, Sebastiano Ricci (1659–1734).
Arcas Preparing to Kill His Mother, by Hendrick Goltzius