Callisto is a beautiful girl in ancient Greek mythology and the origin of the constellation Ursa Major in Greek mythology. Among the Ningfu maids of the hunting goddess Artemis (also known as Diana), she is the most touching.

Callisto was the daughter of King Lycaon, who swore from a young age to remain chaste, not to marry men, and to be in the same spirit as the goddess Artemis. Therefore, she followed the goddess and Artemis also greatly favored this beautiful mortal woman.
She doesn't wander around the stream all day like other elves, strolling in the garden, reciting poetry and poetry, singing and dancing softly. She always wears hunting clothes, carries a divine bow on her shoulders, holds a golden spear, and follows Artemis closely, chasing wild animals in the high mountains and dense forests.
One day, Callisto was resting in the forest and encountered the divine king Zeus on a tour of the world. As soon as Zeus saw the beautiful Callisto, his old habit recurred, and his spring heart couldn't help but ripple. So Zeus transformed into Artemis, approaching Callisto. Callisto, who was unaware of this, was very happy to see the goddess arrive and stepped forward to welcome her.
When "Artemis" (Zeus) kissed her, she realized that the person in front of her was not her mistress, but it was too late. Not long after, Calisto discovered that he was pregnant. In order not to be discovered by Artemis, she carefully covered her gradually bulging belly. However, paper could not contain the fire, and Artemis quickly discovered the secret. She was furious and in a fit of anger, she expelled the innocent Callisto.

Poor Calisto was helpless and could only wander in the forest, eventually giving birth to a son named Arcas. In another sense, Alcas was also the illegitimate son of Zeus, which caught the attention of Zeus' wife Hera. Hera, who was burning with jealousy, poured all her anger on Callisto, turning her into a female bear. Callisto, who had become a mother bear, was unable to continue taking care of his young son Alcas. Therefore, Callisto's father and Alcas' grandfather, Lucarion, adopted the little boy.
After Lucaon's death, Alcas became the new king. One day, Alcas was hunting in the forest and saw a female bear hovering in front of him. Without knowing where he was, he arched and was about to shoot the female bear. This female bear was transformed by Calisto, who recognized her son from a distance and welcomed him in the face of danger, showing great excitement. At this critical moment, the divine king Zeus saw this scene in the sky and remembered the past. He couldn't bear to see the tragedy of human relations happen. Therefore, Zeus quickly transformed these two people into constellations and ascended into the universe. Callisto became the constellation Ursa Major, while her son Alcas became the brightest Arcturus (meaning the protector of bears) in the Herdsman constellation.

Jupiter and Callisto are a world-renowned oil painting created by French painter Boucher in 1744, depicting mythological themes of female beauty.
This oil painting depicting the mythological theme of female beauty can serve as a textbook for composition. Jupiter (Zeus in Greek mythology) fell in love with Lycaon, the daughter of the Arcadian king, Nymphus (also known as Callisto, the goddess of mountains, forests, and water), for her unparalleled beauty. In order to get close to her, Jupiter became the goddess Diana (Artemis in Greek mythology) and came into contact with her. In the painting, Jupiter, transformed into Diana, is teasing the beautiful woman Callisto. Diana is the goddess of the moon and hunting, with a crescent shaped headdress on her head and prey and bows and arrows painted at her feet. Calisto bared his left chest, his delicate and white skin combined with the intricate pleats of the clothes on his body create a strong aesthetic. The overall composition is a pleasing and stable triangle: a pair of beautiful women, intimate on the ground in the wilderness, not like outings, but like sitting on a luxurious palace sofa. This decoration and exaggerated atmosphere were also transformed by several angels on the tree and ground. Some of these angel figures are flying and perching on branches, while one is crouching at Diana's knee. Fantasy and vanity are the main characteristics of Rococo oil painting.