The group comprises estate papers relating to the administration of the Garn estates, mainly in the parishes of Denbigh, Henllan, Llanefydd, Llanrwst, Nantglyn and St Asaph in Denbighshire, Rhuddlan, Flintshire, and Caerhun, Caernarfonshire. They include rentals, 1658-1784, and other estate management papers, 1708-1912, title deeds, 1572-1903, maps and plans, 1776-1866, and domestic management papers, 1725-1885.

Facsimiles of documents relating to the parish of Llannefydd, Denbighshire, comprising pages from manuscripts in the Peniarth Collection and letters in the Lleweni Papers, together with transcripts of the documents by R. D. Roberts and a letter, 1932, to him from W. Ll. Davies, the Librarian at the National Library of Wales.

Faculty papers with associated correspondence and some plans for the church of St. Nefydd & St. Mary, parish of Llannefydd, 1908-1978.