a municipal and parliamentary borough and market-town of Wales, Montgomeryshire, is situated on the Severn, near its confluence with the Clywedog, 19 miles W.S.W. from Montgomery. The town consists partly of hovels built of wood and mud, and partly of recently erected houses, which are gradually replacing the old. The chief buildings are—the new market-house, in the centre of the town, and the ancient church of St Idloes, remarkable for the ornamented pillars and the delicately carved oaken roof, which are said to have been transferred from Cwm Hir Abbey, in Radnorshire. There are extensive sheep walks on the surrounding hills, which supply the materials for the flannel manufacture, the chief source of the town's prosperity. The quarries of coarse slate, and the lead and copper mines on the slopes of Plinlimmon, employ a part of the population. A market for wool and corn is held on Saturday. The borough is contributory to the Montgomery district. Pop. of borough (1851) 3045.