MAESGWIRN (MAES-GWIRN), a hamlet, in the parish of NANTMEL, hundred of RHAIADR, county of RADNOR, SOUTH WALES, 2 miles (E.) from Rhaiadr; containing 390 inhabitants. It forms the south-eastern portionof the parish, and was formerly called Uwch- . At the base of the barren eminence termed Rhiw-Graidd, on the north-western side, is a fine sheet of water, about a mile in circumference, named LlSrn Gwyn, near which, and close to the left bank of the Dulas river, is Llwynbaried House.