England–Wales border after Harold's death at the Battle of Hastings, Wales was again divided without a leader to resist the Normans. Immediately after the Norman conquest of England, King William installed one of his most trusted confidants, William FitzOsbern, as Earl of Hereford. By 1071 he had started the building of Chepstow Castle, the first castle in Britain built of stone, near the mouth of the Wye. It served as a base from which the Normans continued to expand westward into south Wales, establishing a castle at Caerleon and extinguishing the Welsh kingdom of Gwent. William also installed Roger de Montgomerie at
River Wye, Derbyshire River Wye, Derbyshire The River Wye is a limestone river in the Peak District of Derbyshire, England. It is in length, and is one of the major tributaries of the River Derwent, which flows into the River Trent, and ultimately into the Humber and the North Sea. The river's source lies just west of Buxton, on Axe Edge Moor. Part of the flow passes underground through Poole's Cavern before rising at Wye Head, and flowing through the Pavilion Gardens in Buxton. It then flows east, along a route roughly followed by the A6 road. It enters the Peak District, flows