NANTDU (NANT-DO), a chapelry, in the upper division of the parish of CANTREY, hundred of PENCELLY, union of BRECKNOCK and county of BRECKNOCK, SOUTH WALES, 10 miles (S. S. W.) from Brecknock; containing, with the hamlet of Hepste, 111 inhabitants. It is situated on the eastern bank of the TM Vawr, or Greater TM, and at the southern extremity of the parish, through which passes the turnpike-road from Brecknock to Merthyr-Tydvil. Between this place and the northern part of the parish, where stands the mother church, extends part of a long chain of lofty barren mountains, including the Brecknockshire Beacons, one of which is the highest in South Wales. The rateable annual value returned for Nantd5 and the hamlet of Hepste, amounts to £530. The living is a perpetual curacy, endowed with £1000 royal bounty; present net income, £60; patron, Rector of Cantrev; impropriator, Rev. W. -Williams, the incumbent. There is a Sunday school, in which about thirty children are gratuitously taught.