Monmouth Castle

Immediately after the Norman Conquest, William the Conqueror installed three of his most trusted confidants, Hugh d'Avranches, Earl of Chester, Roger of Montgomery, and William FitzOsbern, as the Earls of Chester, Shrewsbury and Hereford respectively. The earldoms served to guard the frontier and provided bases for the Norman invasion of Wales. Over the next four centuries, Norman lords established mostly small Marcher Lordships between the Dee and Severn, and further west.

William FitzOsbern established Monmouth Castle between 1066 and 1069 as a counterpart to his other major castle at Chepstow. It occupied relatively high ground, overlooking the confluence of the Monnow with the River Wye. It was originally an earth and timber ringwork fortress, which was listed in the Domesday Book of 1086. Initially, Monmouth was a fairly typical border castle in the Welsh Marches, presided over by a Marcher Lord and similar in style and status to its near neighbours Grosmont Castle, Skenfrith Castle, White Castle and Abergavenny Castle.

After briefly being held by Simon de Montfort, 6th Earl of Leicester, Monmouth Castle passed into the hands of Edmund Crouchback, Earl of Lancaster and son of Henry III in 1267. He redeveloped the castle, building the Hall and took it as his main residence in the area. It was further improved in the early 14th century, probably by Crouchback's grandson, Henry of Grosmont, 1st Duke of Lancaster. During this period large decorated windows were installed in the upper part of the Great Tower which also had a new roof.