The history of military policing in Great Britain dates back to the middle ages. The post of Provost Marshal has existed since William of Cassingham was appointed by Henry III on 28 May 1241 (the original title was Sergeant of the Peace). On 6 April 1992 the RMP lost its status as an independent corps, and together with the Military Provost Staff Corps, became the Provost Branch of the Adjutant General's Corps. It was, however, permitted to retain the name "Royal Military Police", together with its cap badge and other distinctive insignia including the red cap.