Kallisto

Kallisto or Callisto was a nymph in Greek mythology, a companion of Artemis. Zeus came to her looking like Artemis, and with him she was the mother of Arkas. Hera in her jealousy made Kallisto a bear. Then her son was looked after by Maia, a nymph. 

 References 

 Related pages 
Callisto (moon)

Category:Nymphs