Jano ( in latin Janus, Ianus ) It is, in Roman mythology, a God who had two faces facing both sides of your profile, father of Fontus. Janus was the God of doors, beginnings and endings. Why it was consecrated the first month of the year ( that in Spanish became Latin Ianuarius Janeiro and Janero and from there derived January 41. As God of the beginnings, invoked it is publicly the first day of January, ( Ianuarius ) the month that derived from its name because it starts the new year. He invoked him also at the beginning of a war, and while it lasted, the doors of the temple always remained open; When Rome was at peace, the doors were closed. Janus has no equivalent in Greek mythology.