MYNYDDYSLWYN, a parish in the lower division of the hundred of WENTLLOOG, county of MONMOUTH, 9 miles (N.W. by W.) from Newport, containing, with the hamlets of Clawrplwyf, Mynyddmaen, and Penmain, 3186 inhabitants. The living is a perpetual curacy, in the archdeaconry and diocese of Llandaff, endowed with £600 royal bounty, and £1800 parliamentary grant, and in the patronage of the Bishop of Llandaff. The church is dedicated to St. Tyder.