January

illustration of January from <em>Les Très Riches Heures du duc de Berry</em>The illustration for January from Les Très Riches Heures du duc de Berry, manuscript illuminated by the Limburg Brothers, c. 1416; in the Musée Condé, Chantilly, France.

January, first month of the Gregorian calendar. It was named after Janus, the Roman god of all beginnings. January replaced March as the first month of the Roman year no later than 153 bce.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Amy Tikkanen.
Citation Information
Article Title: January
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 23 February 2024
Access Date: February 22, 2025