"LLAN ILLTWRN, in the Cwmwd of Uwch Caeth, Cantref of Brenhinol (now called the Hundred of Dinas Powys), County of GLAMORGAN, South Wales: a Chapel, not in charge, annexed to the Rectory of St. Fagan's: Patron, The Earl of Plymouth: Chapel dedicated to St. Illtyd. The Resident Population of this Parish, in 1801, was 84. The Money raised by the Parish Rates, in 1803, was £61..0..3 It is 6 m. N.W. from Caerdiff. This Parish contains about 1000 statute acres of Land, all inclosed. The remains of the Monastery are now a Barn. This Chapelry is supposed to have been separated from the Parish of St. Fagan's, about the reign of Queen Elizabeth: it has a Register, and chooses its Warden, and makes its own Rates; but pays to the repairs of St. Fagan's Church and Bridge; and when the Rate for them is made, it pays the third Penny. The Duty of this Chapel is once a day, Morning and Evening alternately, and generally in the Welsh language.- "St. Iltutus founded a Monastery here, A. D. 508, and made it a place for Education in human Learning as well as Religion: so that many worthy Men are said to have been brought up here." - Tanner's Not. Mon. From: A Topographical Dictionary of The Dominion of Wales by Nicholas Carlisle, London, 1811.