January (in Latin,
Ianuarius) is named after the
Latin word for door (ianua), since January is the door to the year and an opening to new beginnings. The month is conventionally thought of as being named after
Janus, the god of beginnings and transitions in
Roman mythology, but according to ancient Roman farmers' almanacs
Juno was the
tutelary deity of the month.
Traditionally, the original
Roman calendar consisted of 10 months totaling 304 days, winter being considered a month-less period. Around 713 BC, the semi-mythical successor of
Numa Pompilius, is supposed to have added the months of January and
February, so that the calendar covered a standard lunar year (354 days). Although
March was originally the first month in the old Roman calendar, January became the first month of the calendar year either under Numa or under the
Decemvirs about 450 BC (Roman writers differ). In contrast, each specific calendar year was identified by the names of the two
consuls, who entered office on May 1 or March 15 until 153 BC, from when they entered office on January 1.
Various Christian feast dates were used for the
New Year in
Europe during the
Middle Ages, including March 25 (
Feast of the Annunciation) and December 25. However, medieval calendars were still displayed in the Roman fashion with twelve columns from January to December. Beginning in the 16th century, European countries began officially making January 1 the start of the New Year once again—sometimes called Circumcision Style because this was the date of the
Feast of the Circumcision, being the seventh day after December 25.
Historical names for January include its original Roman designation, Ianuarius, the
Saxon term Wulf-monath (meaning "wolf month") and
Charlemagne's designation Wintarmanoth ("winter / cold month"). In
Slovene, it is traditionally called prosinec. The name, associated with
millet bread and the act of asking for something, was first written in 1466 in the
Škofja Loka manuscript.
 1 January became the first day of the year in 600
AUC of the Roman calendar (153 BC), due to disasters in the
Lusitanian War. A Lusitanian chief called Punicus invaded the Roman territory, defeated two Roman governors, and killed their troops. The Romans resolved to send a consul to
Hispania, and in order to accelerate the dispatch of aid, "they even made the new consuls enter into office two months and a half before the legal time" (March 15).