Janus Mythology

In Roman mythology, Janus was the god of gates, doors, doorways, beginnings, and endings. His most apparent remnants in modern culture are his namesakes, the month of January and the caretaker of doors and halls: Janitor.

The complete, up-to-date and editable article about Janus Mythology can be found at Wikipedia: Janus Mythology
http://en.wikipedia.org/wiki/Janus_%28mythology%29