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God of all beginnings, gates, transitions, time, duality, doorways, passages, and ending.

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Janus was represented by a double-faced head, and he was represented in art either with or without a beard. Occasionally he was depicted as four-faced—as the spirit of the four-way arch.

https://www.britannica.com/topic/Janus-Roman-god

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In ancient Roman religion and myth, Janus (/ˈdʒeɪnəs/ JAY-nəs; Latin: Ianvs [ˈi̯aːnʊs]) is the god of beginnings, gates, transitions, time, duality, doorways, passages, frames, and endings. He is usually depicted as having two faces. The month of January is named for Janus (Ianuarius).

Janus presided over the beginning and ending of conflict, and hence war and peace. The gates of a building in Rome named after him (not a temple, as it is often called, but an open enclosure with gates at each end) were opened in time of war, and closed to mark the arrival of peace. As a god of transitions, he had functions pertaining to birth and to journeys and exchange, and in his association with Portunus, a similar harbor and gateway god, he was concerned with travelling, trading and shipping.

https://en.wikipedia.org/wiki/Janus

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