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
England and Wales framework and history. England and Wales England and Wales () is a legal jurisdiction covering England and Wales, two of the four nations of the United Kingdom. "England and Wales" forms the constitutional successor to the former Kingdom of England and follows a single legal system, known as English law. The devolved National Assembly for Wales () was created in 1999 by the Parliament of the United Kingdom under the Government of Wales Act 1998 and provides a degree of self-government in Wales. The powers of the Assembly were expanded by the Government of Wales Act 2006, which allows it