"LLANDEWY YSTRADENNY, a parish in the hundreds of Cefnllys and Knighton, county Radnor, 11 miles S.W. of Rhayader, its post town, and 15 from Pen-y-bout. It is situated in a valley watered by the river Ithon. From various points are obtained views of mountain scenery. The parish includes the townships of Llanfihangel-Rhydithon, Mystyrrhoesllowdy, and Church. The road here crosses the Ithon by a stone bridge. The living is a perpetual curacy in the diocese of St. David's, value with that of Llanfihangel-Rhydithon, £112, in the patronage of the Chancellor of Brecon. The church is dedicated to St. David. The charities amount to £2 per annum. Here are ruins of a Norman castle called Castell Cymaron, which anciently belonged to the Mortimers, earls of Chester, and on an eminence nearly opposite to it are British earthworks called the Gaer."
"CHURCH, a township in the parish of Llandewy Ystradenny, in the county of Radnor, 9 miles W. of Rhayader."
"MYSTYRRHOES-LLOWDY, a township in the parish of Llandewy-Ystradenny, county Radnor, 8 miles N.W. of Radnor."