suburb of the town. The ground rises gradually in the north of the town before steepening to form the Deri and Rholben spurs of Sugar Loaf. The A4143 crossing of the Usk by means of the historic Usk Bridge is sited at the narrowest point of the floodplain, a site also chosen for the former crossing of a tramroad and the later mainline railway. The high ground at either side is formed by a legacy of the last ice age, the recessional Llanfoist moraine which underlies both the village which gives it its name, the town centre and the Nevill Hall area. The older parts of the town north of its centre are built upon a relatively flat-lying alluvial fan extending west from the area of St Mary's Priory to Cantref and of similar age to the moraine. In the UK 2011 census, the six relevant wards (Lansdown, Grofield, Castle, Croesonen, Cantref and Priory) collectively listed Abergavenny's population as 12,515. History Roman period Gobannium was a Roman fort guarding the road along the valley of the River Usk, which linked the legionary fortress of Burrium (Usk) and later Isca Augusta or Isca Silurum (Caerleon) in the south with Y Gaer, Brecon and Mid Wales. It was also built to keep the peace among the local British Iron Age tribe, the Silures. Cadw considers that the fort was occupied from around CE50 to CE150. Remains of the walls of this fort were discovered west of the castle when excavating the foundations for a new post office and telephone exchange building in the late 1960s. 11th century Abergavenny grew as a town in early Norman times under the protection of the Baron Bergavenny (or Abergavenny). The first Baron was Hamelin de Balun, from Ballon, a small town with a castle in Maine-Anjou near Le Mans. Today it is in the Sarthe département of France. He founded the Benedictine priory, now the Priory Church of St Mary, in the late 11th century. The Priory belonged originally to the Benedictine foundation of St. Vincent Abbaye at Le Mans. It was subsequently endowed by William de Braose, with a tithe of the profits of the castle and town. The church contains some unique alabaster effigies, church monuments and unique medieval wood carving, such as the Tree of Jesse. 12th and 13th centuries Owing to its geographical location, the town was frequently embroiled in the border