Februarius
The Februarius was originally the underworld month and was in the old year in office of the Roman calendar in twelfth position and is a precursor of today's month of February. It takes its name from the Latin word februare ( atone, cleanse ).
With the made in the year 153 BC by the laying years commencement of the year to 1 January Februarius embodied after the second month of the year in office. After the calendar reform of Gaius Julius Caesar took place from the year 45 BC in a leap year, the insertion of an additional day.