Janus:
Janus is the Roman "two-faced" God of doorways and gates; entrances and exits. Because of this, he is depicted as looking both forward and back at the same time.
Jupiter:
Jupiter is the Roman God of the sky, and is the father
of gods and men, in Roman mythology. His Greek counterpart
is Zeus.
Juno:
Juno is the Roman Goddess of women and motherhood. She is wedded to Jupiter and her Greek counterpart is Hera.