LLANUWCHYLLYN, a village and a parish in Bala district, Merioneth. The village stands on the rivulet Dwfrdwy, near the head of Bala lake, and near a railway which was in course of formation in 1866 from Corwen to Barmouth, amid a wild country under the Arrenig and Berwyn mountains, 5 miles SSW of Bala; and has a post office under Corwen, and fairs on 25 April, 20 June, 22 September, 16 October, and 22 November.—The parish comprises the townships of Castell, Cynllwyd, Penanlliw, and Penarran. Acres, 12,000. Real property, £4,692. Pop. in 1851, 1,264; in 1861,1,145. Houses, 263. The property is divided among a few. Slate is quarried; and a gold-mine was worked ion 1866-7. A waterfall is on the river Twrch, at Bwlchy-Grols pass. A Roman fortalice is supposed to have been at Caer-Gai; and Roman coins have been found there. The living is a vicarage in the diocese of St. Asaph. Value, £200. Patron, Sir W. W. Wynn, Bart. The church is dedicated to St. Deiniol, contains the effigies of a knight, and was reported in 1859 as wretchedly uncomfortable. The name Llanuwychyllyn alludes to the church's situation in reference to Bala lake, and signifies ' ' the church above the lake. ''There are a Calvinistic Methodist chapel, an endowed school with £25 a year, alms houses with £42, and other charities £29. R. Vaughan, the translator of the ' ' Practice of Piety, ''resided at Caer-Gai.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))