The Lord Grand Prior's Regiment, also known as Fitzjames' Regiment and as the Regiment of the Marine (Régiment de la Marine d'Angleterre), was an infantry regiment originally raised in Ireland to fight for the deposed monarch James II during his war against his successor, William of Orange. While technically classed as a regiment of marines for much of its existence, as James possessed no navy it generally fought as conventional infantry. Its colonel was James's illegitimate son Henry Fitzjames, Grand Prior of the Knights of Malta, although in practice field command was delegated to an experienced lieutenant-colonel.
