Jupiter discovered a young maiden living on Earth named Lo, he went to see her. When Jupiter's wife Juno found out, she was like rainbow's and sunshine! Wrong. Juno was furious! Jupiter feared what Juno might do to Lo, so he turned Lo into a cow.
Juno realized Jupiter's trick, she banished Lo. Jupiter tried to help Lo, including sending Mercury to save her, but all attempts were foiled by Juno. Finally Jupiter had a brilliant plan. He waited for Juno to fall asleep and snuck out. He went to see Lo, and he turned her back into a human.
Yes, Jupiter has taken on multiple identities. In Ancient Greece, Jupiter took the identity of Zeus. The Italic Diespiter was also a Sky God who manifested himself in the daylight, usually but not always identified with Jupiter.