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.

'A rough Copy [made by D. Harris Williams] of an Elaborate Pedigree of the Bodlwithan Family', originally drawn up in 1660 by Griff: Hughes; notes on the seals of some bishops of St Asaph; extracts from the registers, etc. of Tremeirchion; and notes relating to Cornish names.

Faculty papers with associated correspondence and some plans for the church of St Asaph and St Cyndeyrn, St Asaph, 1829-1991.