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cathedral town, Powys county, historic county of Brecknockshire, Wales, on the River Usk at its confluence with the Honddu and Tarell. The town grew up around a Norman castle built in 1092. The Benedictine Priory of St. John was founded about the same time; the former priory church, dating from the 13th century, became in 1923 the cathedral for the newly constituted diocese of Swansea and Brecon of the Church in Wales.