0 in Roman mythology (= ancient stories), the god of beginnings, gates, and doorways. He is often shown with two faces, one looking forward and one looking backward: --
The two faces of the god Janus had appeared on opposite sides of Rome’s War Gates.
Janus developed into a god of all beginnings, and accordingly the month of January was named in his honour.
A Roman god, Janus guarded doorways and was therefore the god of auspicious beginnings.
Janus is the two-faced Roman god that glimpses both the past and the future.