Ianus was a purely Roman god, and wasn't in any of the Greek myths.
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Janus did not exist in ancient greek mythology.
Janus is a Roman god, and not minor to the minds of ancient Romans.
Janus
Couple of points: 1. Janus wasn't a Greek god, he was purely Roman. He was the God of beginnings and doorways, and in their pantheon was the first god. 2. The Romans didn't always have animal companions for their gods, thusly Janus had no animal as a favorite.
Janus the god of doors and gateways had two faces, but he is a Roman god, not Greek.