The double-head looking both ways was connected with the gate that opened both ways.
To make him god of the sun and of the year is the less justifiable, because the month that bears his name was originally the eleventh, not the first; that month seems rather to have derived its name from the circumstance, that at this season after the rest of the middle of winter the cycle of the labours of the field began afresh.
It was, however, a matter of course that the opening of the year should also be included in the sphere of Ianus, especially after Ianuarius came to be placed at its head.
5.

I.IV.

Tities and Luceres 6.

I.VI.

Amalgamation of the Palatine and Quirinal Cities 7.