years before present (BP). Roman times The first recorded settlement at Monmouth was the small Roman fort of Blestium, one of a network of military bases established on the frontiers of the Roman occupation. This was connected by road to the larger Roman towns at Glevum (Gloucester) and Isca Augusta (Caerleon). Archaeologists have found Roman pottery and coins within the modern town centre. During the later Roman period, between the 2nd and late 4th centuries, it appears to have been a centre for iron working, using the local iron ores and charcoal also worked at nearby Gobannium (Abergavenny) and Ariconium (near Ross-on-Wye). The Middle Ages After the end of Roman rule in Britain, the area was at the southern edge of the Welsh kingdom of Ergyng. The only evidence of continuing settlement at Monmouth is a record of a 7th-century church, at an unknown location within the town, dedicated to the Welsh saint Cadoc. In 1056, the area was devastated by the Welsh prince Gruffydd ap Llywelyn, on his way with an army of Welsh, Saxons and Danes to defeat Ralph, Earl of Hereford, and sack the Saxon burh at Hereford, to the north. Following the Norman conquest of England in 1066, the Earldom of Hereford was given to William FitzOsbern of Breteuil, Normandy, one of King William's closest allies, who was responsible for defending the area against the Welsh. A new castle was built at Monmouth, holding commanding views over the surrounding area from a sound defensive site and exerting control over both river crossings and the area's important resources of farmland, timber and minerals. Initially it would have been a motte and bailey castle, later rebuilt in stone, and refortified and developed over time. A town grew up around it, and a Benedictine priory was established around 1075 by Withenoc, a Breton who became lord of Monmouth after Roger, the son of William fitzOsbern, was disgraced. The priory may have once been the residence of the monk Geoffrey of Monmouth, who was born around 1100 and is best known for writing the chronicle Historia Regum Britanniae ("History of the Kings of Britain"). The town was recorded in the Domesday Book as part of Herefordshire, and expanded thereafter. There was early burgage development along Monnow Street, and the suburb of Overmonnow, west of the river and protected by a defensive moat called the Clawdd-du or Black ditch, began to