CYFEILIOG (CYFYLLIOG), a parish, in the hundred of RUTHIN, county of DENBIGH, NORTH WALES, 5 miles (W.) from Ruthin, containing 636 inhabitants. It is situated in the southern portion of the county, and is intersected by several small streams, which, rising in the circumjacent hills, unite within the parish, and, flowing in a north-easterly direction, fall into the river Clwyd. It comprises a moderate extent of amble and pasture land in a good state of cultivation; the surface is varied, and the soil, especially in the lower grounds, is tolerably fertile. The surrounding scenery is pleasingly diversified, though not distinguished by any peculiarity of feature; and the views, though obstructed in some parts by the intervening heights by which the parish is sheltered, are neither destitute of interest nor void of beauty. The living is annexed to the vicarage of Llauynys, in the archdeaconry of Merioneth, and diocese of Bangor. The church, dedicated to St. Mary, is not remarkable for any architectural details. An endowment of £3 per annum has been bequeathed for the instruction of poor children; and the produce of several small charitable donations is annually distributed among the poor. The average annual expenditure for the support of the poor is £308. 5.