TREVRIW (TRAF-RIW), a parish, in the union of LLANRWST, Uobgorvai division of the hundred of NANTCONWAY, county of CARNARVON, NORTH WALES, on the road from Aberconway to Llanrwst, 2 miles (x. N. W.) from Llanrwst; containing 423 inhabitants. The village is situated on the western bank of the river Conway, up which the tide flows to it; and vessels of sixty tons' burthen come to this place, bringing coal, lime, and other heavy goods for Llanrwst and the neighbouring parishes, and conveying downwards the produce of the slate quarries of Trevriw and Llanrhyohwyn. Lead-ore and zinc exist in the parish, and has been procured to a considerable extent; its rateable annual value is returned at £764. 5. 8. Fairs are held on May 12th, September 3rd, and November 7th. The living is a discharged rectory, with the perpetual curacy of Llanrhychwyn annexed, rated in the king's books at £7. 15. 10.; present net income, £168; patron, Bishop of Bangor: the tithes of this parish and that of Llanrhychwyn have been commuted for a rent-charge of £200, payable to the incumbent; and there is a glebe of nearly acre. The church, dedicated to St. Mary, a small edifice, consisting of a nave, ohancel, and north aisle, is stated to have been built by Prince Llewelyn the Great, about the year 1230, " for the ease of his princess, who before was obliged to go on foot to Llanrhychwyn, a long walk among the mountains." There are places of worship for Independents and Calvinistic Methodists: a day school affords instruction to about 50 children at the expense of their parents; and a Sunday school, consisting of about 170 males and females, is gratuitously conducted by Methodists. Llewelyn ab Iorwerth is said to have had a palace here, situated in apiece now called Gardd-y-Neuadd, where some hewn stones were discovered, which have since been used in building a wall, and are pointed out as the only remaining fragments of the royal habitation. Dr. Thomas Williams, a physician, who compiled a Latin and Welsh Dictionary, and wrote some other works, which are preserved in manuscript, was, according to Mr. Owen, a native of Trevrnv, where he died about the year 1620.