LLYSWEN, a parish in Hay district, Brecon; on the river Wye, at the boundary with Radnor, near Boughrood r. station, and 7 miles SW by W of Hay. It has a post office under Hereford. Acres, 2,067. Real property, £1,152. Pop., 226. Houses, 50. The property is divided among a few. A palace of the princes of South Wales was here. Dderw was a seat of the Morgans. Llangoed Castle belongs to Sir J. R. Bailey, Bart. The living is a rectory in the diocese of St. David's. Value, £170.* Patron, Sir J. R. Bailey, Bart. The church was rebuilt in 1863; is in the early English style; and has a W tower, designed to be surmounted by a spire. The rectory-house was built in 1865. There is national school.

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