Radyr (Rhaiadr) - From 'A Topographical Dictionary of Wales' (1849)
RADYR (RHAIADR), a parish, in the poorlaw union of Cardiff, hundred of Kibbor, county of Glamorgan, in South Wales, 3� miles (N. W. by W.) from Cardiff; containing 279 inhabitants. This parish probably derives its name, signifying "a cataract," from the rushing waters of the river T�f, by which it is bounded on the north-east. It was formerly comprehended within the hundred of Miskin, but has been recently separated therefrom. It comprises about eleven hundred acres of arable and pasture land, inclosed and in a profitable state of cultivation: the surface is in some parts elevated, and in others flat, but no where subject to inundation; the soil is a strong brown earth, favourable to the production of good crops of grain of all kinds, potatoes, and hay. The substratum is partly a hard brown stone, and partly limestone of very good quality. Radyr Court, formerly the seat of the family of Matthew, ancestors of the late Lord Llandaf, has been partially taken down, and the remainder has been modernised, and converted into a farmhouse. The turnpike-road leading from Cardiff to Llantrissent passes a little to the south of the parish; and the T�f-Vale railway runs through it, nearly parallel with the river, which is crossed by the line in this vicinity. Some of the inhabitants are employed at the iron-works in the parish of Pentyrch.
The living is a vicarage, endowed with �200 royal bounty; patron and impropriator, the representative of the late Earl of Plymouth, who is lord of the manor: the tithes have been commuted for �113. 9., of which a sum of �38. 9. is payable to the impropriator, and a sum of �75 to the vicar. The church, dedicated to St. John the Baptist, is a neat plain edifice, with a curious turret at the west end. There is a place of worship for Calvinistic Methodists; a Sunday school for gratuitous instruction is held in it, and another at Radyr Court. In the parish is a spring of very cold water, called Y Pistyll Goleu, "the bright water-spout," issuing from the side of a hill, under a considerable depth of earth over a limestone rock: it has by some writers been termed mineral, but it is not known to possess any other properties than that of its extreme coldness, which renders it efficacious in curing sprains and weakness of the sinews.