TREWERN-with-WILLER (TRA-WERN), a hamlet, in that part of the parish of LLANVIHANGELNANT-MELAN which is within the liberties of the borough of NEW-RADNOR, county of RADNOR, SOUTH WALES, 6 miles (W.) from New Radnor; containing 153 inhabitants. It forms the extreme western dive. sion of the parish, occupying the southern declivity of a lofty mountain which anciently composed a part of the forest of New Radnor. Trewern stands ea the upper portion of the eminencey and Gwiller Oa the lower, with the road from New Radnor to Rhaiadr passing between them. There are two large tumuli on the hill. The tithes have been commuted for a rent-charge of £168, of which a sum of £100 is paid to the impropriator, subject to rates, averaging £9 per annum; and £68 to the vicar of Llanvihangel. Nant-Meian, subject to rates, averaging £3.