The 1st Infantry Regiment ("1er Régiment d'Infanterie", abbreviated 1er RI) is an infantry regiment of the French Army, founded in 1479 as one of the oldest regiments in active service in the world. It is an offspring of the "bande de Picardie" under the Ancien regime, and one of the five oldest regiments in France. It particularly distinguished itself, as the "1ère Demi-Brigade d'Infanterie de Ligne", during the French Revolutionary Wars at the Battle of Fleurus (1794), the Battle of Messkirch (1800) and the Battle of Biberach (1800). The regiment has been patroned by the city of Saint-Amand-Montrond since 12 April 2003.