LLANGWM (LLAN-GWM), a parish, in the union of HAVERFORDWEST, hundred of RHOS, county of PEMBROKE, SOUTH WALES, 5 miles (S. E. by S.) from Haverfordwest; containing 796 inhabitants. This parish, the name of which signifies " the church in the vale," is pleasantly situated on the western bank of Milford Haven, about the same distance from Pembroke as from Haverfordwest. Great Nash, formerly the residence of the family of Owen, now of Orielton, and long noted for its hospitality, is deserted by its proprietor, and in ruins: Dumpledale is a handsome modern mansion, very pleasantly situated, and commanding a fine view of the Haven. At the village, which extends along the shore, is a horse ferry to the parish of Coedcanlais. The inhabitants are principally engaged in a lucrative oyster fishery, the produce of which is generally sold at two shillings per bushel (Winchester measure), to dealers from the coast of Kent, more especially to those of Chatham and Rochester, by whom they are taken away in sloops for the supply of the London market; the average annual amount of the profits of the fishery is about £2000, and in good seasons it frequently exceeds £3000. Coal and culm are found in great abundance: the mines are worked by Sir John Owen, Bart., who is the principal proprietor, and the produce is shipped at Hook Quay, for the supply of the neighbouring districts. The rateable annual value of the parish has been returned at £1545. The living is a discharged rectory, rated in the king's books at £7. 12. 11., and endowed with £200 parliamentary grant; patrons, alternately, Sir J. Owen, and Mrs. Owen Barlow: the tithes have been commuted for a rent-charge of £190, subject to rates, averaging £23. 15. 2. per annum; and there is a glebe of 35 acres, valued at £36 per annum; also a glebe-house. The church, dedicated to St. Hierom, is a spacious and venerable structure, in the early style of English architecture, and contains some ancient monuments, among which are several to the memory of the family of Roch: it was until lately in a very dilapidated state, but has been just repaired, its interior neatly celled and thoroughly renewed, and the exterior preserved in its ancient style, at a cost of £300, including a sum expended by the incumbent on the chancel. There is a place of worship for Methodists. Thomas Koch, in 1707, bequeathed a portion of a small rent-charge, amounting to £1, for the instruction of the poor; but the only schools are one for infants, in which 11, and a day school, in which 15, children are taught at the expense of their parents.