The King's Own Royal Border Regiment was an infantry regiment of the British Army, part of the King's Division. It was formed in 1959 through the amalgamation of two other regiments: Infantry of the Royal Irish Rifles during the Battle of the Somme in World War I. Infantry are soldiers who fight primarily on foot with small arms in organized military units, though they may be transported to the battlefield by horses, ships, automobiles, skis, or other means. ... A regiment is a military unit, consisting of a group of battalions, usually four and commanded by a colonel. ... The British Army is the land armed forces branch of the British Armed Forces. ... The Kings Division is a British Army command, training and administrative apparatus designated for all land force units in the North of England. ... 1959 (MCMLIX) was a common year starting on Thursday of the Gregorian calendar. ...

• The King's Own Royal Regiment (Lancaster)
• The Border Regiment

In 2004, as part of the restructuring of the infantry, it was announced that the King's Own Royal Border Regiment would amalgamate with the King's Regiment and the Queen's Lancashire Regiment to form the new Duke of Lancaster's Regiment (King's Lancashire and Border). The new regiment was formed on 1st July 2006, with the KORBR forming the 3rd Battalion. 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... The Kings Regiment is a regiment of the British Army, part of the Kings Division. ... The Queens Lancashire Regiment (QLR) is an infantry regiment of the British Army, part of the Kings Division. ... The Duke of Lancasters Regiment (Kings, Lancashire and Border) is one of the new large infantry regiments of the British Army. ...

The regiment earliest forebears were the Kings Own Royal Regiment, the Fourth Regiment of Foot, formed in 1680, literally the fourth regiment of the British Army to be formed, and so very senior. The 34th and 55th Regiments of Foot were formed later in 1705 and 1745, respectively. In 1881 they amalgamated to form the Border Regiment, a fearsome force of Cumbrians who fought in the Battle of Arnhem in 1944 and also fought the bitter war accross Burma.