Callisto (mythology) afterwards, when she was already with child, was seen bathing and so discovered. Upon this, the goddess was enraged and changed her into a beast. Thus she became a bear and gave birth to a son called Arcas. Either Artemis "slew Kallisto with a shot of her silver bow," perhaps urged by the wrath of Juno (Hera) or later Arcas, the eponym of Arcadia, nearly killed his bear-mother, when she had wandered into the forbidden precinct of Zeus. In every case, Zeus placed them both in the sky as the constellations Ursa Major, called "Arktos" (αρκτος), the "Bear", by Greeks,
Arethusa (mythology) Arethusa (mythology) In Greek mythology, Arethusa (; ) was a nymph and daughter of Nereus (making her a Nereid), who fled from her home in Arcadia beneath the sea and came up as a fresh water fountain on the island of Ortygia in Syracuse, Sicily. The myth of her transformation begins in Arcadia when she came across a clear stream and began bathing, not knowing it was the river god Alpheus, who flowed down from Arcadia through Elis to the sea. He fell in love during their encounter, but she fled after discovering his presence and intentions, as she wished