Letters to Sir William Maurice, 1609, [Sir John Owen], 1634, and Mrs [Jonet?] Owen, [c. 1637], William Wynn of Glyn, 1644, Sir Robert and Dame Margaret Owen, [1682x1698], 1698-1725, Ellen Owen, 1688-[c. 1702], Jane Owen, 1700-1703, William Owen, 1714-1765, Mary Owen, 1736-1779, Robert Godolphin and Ellen Owen, 1769-1793, Owen Ormsby, 1793-1796, Mary Jane Ormsby-Gore, 1810-1860, William Ormsby-Gore, 1822-1859, and William Richard Ormsby-Gore, 1880-1888, received from the Caernarfonshire and Merionethshire estate stewards, tenants, solicitors and other individuals concerning estate business, accompanied by occasional replies and relevant letters from third parties. Recurrent subjects include problems associated with tenancies and property repairs on the Clenennau, Glyn and Ystumcegid estates, accounts and outgoings, provision of commodities, family and local news, rights to sitting places in church, creation of burgesses, particularly at Cricieth, [1688x1702], 1793, 1796, enclosures, trespasses, crown lands, exploitation of timber and extraction of minerals (1880s especially). Particular topics of interest include the mortgage on Ystumcegid, 1688-1703; horse racing in Caernarfonshire, 1732; purchase of Dolbenmaen, 1735-1736; the construction of the Porthmadog railway; road improvement and other public works; the authority of the mayor and bailiff of Bala; building leases on Corporation land at Cricieth; and construction of a factory at Singrig [Llanfihangel-y-Traethau], 1841-1860. Several of the letters incorporate agent's accounts.

A Reprint of Report of Mr. (afterwards Sir John) Jervis on the Crown Rights in Merioneth and the Agenda of Special Meeting of the Caernarvonshire County Council, 17 February 1910, and Minutes of Meeting of Committee re Commons, both printed at Caernarvon and annotated by Charles E. Breese.

Title deeds of lands acquired through 'tir prid' conveyances, purchase, leasehold and exchange by the successive owners of the Clenennau estate, lying in Caernarfonshire, mainly in Penyfed and Pennant, Dolbenmaen, Penmorfa and the surrounding parishes, 1427-1732, and in Merionethshire, around Llanfihangel-y-Traethau, Harlech and Llanfrothen, 1454-1833. Several of the deeds refer to crown lands, which were much disputed and subject to investigation by government officials. Some of the Merionethshire deeds are accompanied by or endorsed with nineteenth century notes

Commissions and orders to Thomas Hanbury, auditor of North Wales, 1590, and other officials, 1606, 1650, to conduct investigations into the crown lands in Dolbenmaen, encompassing the boundaries and commons of Dolbenmaen, and the townships of Rhedynogfelen and Gest.

A copy of the Report of [Sir] John Jervis on Crown Rights in Merioneth, 1840; notes and press cuttings relating to Crown Lands in Caernarvonshire; copies of resolutions passed at a Conference of local Councils, 12 September 1910; and a note on the acquisition of land for afforestation in Wales, 1920.