Arcas

In Greek mythology, Arcas (Ἀρκάς) was the son of Zeus and Callisto. Callisto was a nymph in the retinue of the goddess Artemis. Zeus, being a flirtatious god, wanted Callisto for a lover. As she would not be with anyone but Artemis, Zeus cunningly disguised himself as Artemis and seduced Callisto. The child resulting from their union was called Arcas.