LLANTHEWY-VACH, a parish in the lower division of the hundred of USK, county of MONMOUTH, 3 miles (S. W.) from Usk, containing 172 inhabitants. The living is a perpetual curacy, in the archdeaconry and diocese of Llandaff, endowed with £1000 royal bounty, and in the patronage of the Principal and Fellows of Jesus College, Oxford.