In Roman myths, Janus is the two-faced god associated with beginnings and endings. He represents transitions, gates, and time, often depicted as looking both forward and backward. Janus presides over various rites of passage, such as the New Year, symbolizing the potential of new beginnings while acknowledging the past. His duality underscores the notion of change and the cyclical nature of time, reinforcing his significance in Roman religion and culture as a mediator between realms.