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 scullers of all abilities, next to the local rowing club. Walkers can enjoy the Wye Valley Walk which follows the route of the River Wye from Coed Hafren, near Plynlimon, to Chepstow along a series of well-maintained way-marked paths. A viewpoint near The Biblins on the Wye is known as 'Three Counties View', the meeting place of the counties of Herefordshire, Gloucestershire and Monmouthshire. The Wye's tributaries include the river Lugg, Elan, Dulas, Irfon, Marteg, Monnow, Trothy, Ithon, Llynfi, Letton Lake, Tarennig (the Wye's first tributary) and Bidno. The Romantic poet William Wordsworth includes an apostrophe to the Wye in