For 10 points, name the Roman god of choices and beginnings who has two faces and is the namesake of the first month of the calendar.
This god, who was depicted on coins called asses, raped the nymph Carna and commemorated the event by giving her a white hawthorn branch and the ability to control hinges. This god's wife Juturna and his son Fontus are both associated with wells and springs. Temples dedicated to this god kept their doors always closed during peacetime and always open during wartime. For 10 points, name the Roman god of choices and beginnings who has two faces and is the namesake of the first month of the calendar.
This god, who was depicted on coins called asses, raped the nymph Carna and commemorated the event by giving her a white hawthorn branch and the ability to control hinges.
Janus [or Ianus]