Why is January called January?

Answer 1

January is named after Janus (Ianuarius), the god of the doorway; the name has its beginnings in Roman mythology, coming from the Latin word for door (ianua) - January is the door to the year. Traditionally, the original Roman calendar consisted of 10 months, totalling 304 days, winter being considered a monthless period. Around 713 BCE, the semi-mythical successor of Romulus, King Numa Pompilius, is supposed to have added the months of January and February, allowing the calendar to equal a standard lunar year (355 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, years in dates were identified by naming two consuls, who entered office on May 1 and March 15 before 153 BC when they began to enter office on January 1.