Februarius in the context of "Numa Pompilius"

Lupercalia, also known as Lupercal, was a pastoral festival of Ancient Rome observed annually on February 15 to purify the city, promoting health and fertility. Lupercalia was also known as dies Februatus, after the purification instruments called februa, the basis for the month named Februarius.

Martius or mensis Martius ("March") was the first month of the ancient Roman year until possibly as late as 153 BC. After that time, it was the third month, following Februarius (February) and preceding Aprilis (April). Martius was one of the few Roman months named for a deity, Mars, who was regarded as an ancestor of the Roman people through his sons Romulus and Remus.

March marked a return to the active life of farming, military campaigning, and sailing. It was densely packed with religious observances dating from the earliest period of Roman history. Because of its original position as the first month, a number of festivals originally associated with the new year occurred in March. In the Imperial period, March was also a time for public celebration of syncretic or international deities whose cultus was spread throughout the empire, including Isis and Cybele.

Ianuarius, Januarius ("January"), or in full mensis Ianuarius, abbreviated Ian., was the first month of the ancient Roman calendar, from which the Julian and Gregorian month of January derived. It was followed by Februarius ("February"). In the calendars of the Roman Republic, Ianuarius had 29 days. Two days were added when the calendar was reformed under Julius Caesar in 45 BCE.

In the oldest Roman calendar, which the Romans believed to have been instituted by their legendary founder Romulus, the first month was Martius ("month of Mars", March), and the calendar year had only ten months. Ianuarius and Februarius were supposed to have been added by Numa Pompilius, the second king of Rome, originally at the end of the year. It is unclear when the Romans reset the course of the year so that January and February came first. Ianuarius is conventionally thought to have taken its name from Janus, the dual-faced god of beginnings, openings, passages, gates and doorways, but according to ancient Roman farmers' almanacs Juno was the tutelary deity of the month.