LLANLLEON-VEL, a hamlet and a parish in Builth district, Brecon. The hamlet lies on the rivers Irvon and Dulas, 6½ miles W by S of Builth r. station. Acres, 2,834. Real property, £980. Pop., 188. Houses, 33.—The parish contains also the hamlet of Gwarafog; and it is traversed by the Sarn Helen way, sometimes called Lleon, and seemingly the origin of part of the parish's name. Post town, Builth, Breconshire. Acres, 2,900. Real property, £1,327. Pop., 250. Houses, 43. The property is divided among a few. Garth was the seat of the Gwynnes, and is now a farm-house. The living is a vicarage in the diocese of St. David's. Value, £60. Patron, the Bishop of St. David's. The church contains some murai monuments of the Gwynnes, and was reported in 1859 as not good.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))