Deeds and documents, 1598-1856, mostly assignments of mortgage and related bonds, concerning Dôl y Cae and other premises in the parish of Tal-y-llyn, including a lease from William Owen Pughe and his brother Richard to his son Aneurin Owen Pughe.

Copies of the Queen's instructions to Henry, Earl of Pembroke, Lord President of the Council in Wales and the Marches, 1586; the commission of the lieutenancy of Wales and the Marches to Henry, Earl of Pembroke, March 22, 1600, with power to make deputations to persons named in the commission for the different counties within the lieutenancy; a petition by six members of the Privy Council to the Lord Keeper to renew the commission of lieutenancy for Merioneth and to leave out the names of John Lewys Owen and Cadwalader ap Ris, who had been arraigned before the Court of Star Chamber for misdemeanours, and to appoint Griffith Vaughan and Robert Lloyd to be deputies for the Earl of Pembroke for that county; a Privy Council letter to the same effect covering a renewed commission to the Earl of Pembroke, March 31, 1600, with a list of justices of the peace for Merioneth; and orders for the reformation of the Court of the Marches, 1577.

Papers of the Pale estate belonging to Henry Beyer Robertson, 1879-1950, comprising correspondence on Council matters, especially the contract between Bala Urban District Council and Merionethshire County Council for the upkeep of the main roads, 1880-1948; pamphlets, diagrams and letters concerning the Pale hydro-electric plant, 1892-1936; and miscellaneous papers, 1885-1948, including items relating to the 1885 general election campaign in Merionethshire.

Papers, 1634-1928, mostly deriving from and relating to the legal practice of Henry Rumsey Williams, comprising draft conveyances, abstracts of title, letters, accounts and miscellaneous papers of clients, including the estate of Wynn of Glynllifon, 1719-1840, the Griffiths family of Caernarfon and Amwlch, 1726-[1830s], Jared Jackson, 1760-1836, Plasgwyn estate, 1761-1846, Cefn Cwmwd estate, 1763-1828, Coed Helen estate, 1770-1838, Trergo estate, 1771-1832, Parry family, 1773-1788, Peniarth estate, 1773-1830, Orielton estate, 1774-1814, Bodior estate, 1778-1837, Faenol estate, 1778-1840, Arnold Robinson Burrowes, 1785-1837, Grindley family, [c. 1786]-1842, Morgan family, 1787-1839, Treiorwerth estate, 1787-1844, Evan Pritchard, 1788-1813, John Price, 1790-1844 Caerhun estate, 1791-1834, W. A. Madocks, 1799-1824, Nancall estate, 1802-1837, Morris Griffith, 1804-1832, Edward Griffith Roberts, 1805-1827, William Humphrey, 1805-1833, Plas Llanfair estate, 1805-1837, Baily Williams family, 1806-1838, Richard Garnons, 1809-1837, Cefn Hengwrt estate, 1810-1815, George Bettiss, 1810-1831, William Edwards, 1811-1836, Penrhyn estate, 1811-1837, Wyatt family, 1813-1835, Gelli Goch estate, 1815-1831, Anna Maria Wynne, 1816-1833, Robert Thomas, 1818-1839, Roberts family, 1818-1840, Bodegroes estate, 1819-1836, Hughes, Brydges and Granville, bankers, 1819-1840, Vickers family, 1820-1833, Boston estate, 1820-1839, Owen Griffith, 1822-1846, George Holmes Jackson, 1823-1841, the Rev. Hugh Hughes Wynne, 1831-1848, John Rowlands, 1832-1841, and Edward Hosier Williams, 1833, in Caernarfonshire, Anglesey, Denbighshire, and Merionethshire; legal correspondence, 1790-1848, probate records, 1727-1871, and papers relating to civil cases, 1757-1850, religion, 1788-1842, mining, 1779-1842, quarrying, 1798-1840, shipping, 1778- [c. 1841], roads and railways, 1834-1839; legal practice records, 1804-1841, and executorship papers, 1841-1855, belonging to Henry Rumsey Williams, and records of his family in Brecknockshire, Monmouthshire and Caernarfonshire, 1881-1928. Records relating to William's political activities have not survived.

Professional papers of Ywain Goronwy ap Griffith comprising agreements, specifications, plans and correspondence, 1927-53, mainly relating to the alteration, repair and erection of new buildings, both private and public, in Merionethshire, Montgomeryshire and Caernarfonshire; files relating to work done in the diocese of Bangor, mainly in the form of alterations and repairs to vicarages, 1932-1952; and papers, 1920-40, relating to the redemption of tithe rent-charges in various parishes of Anglesey, Caernarfonshire, Cardiganshire and Merionethshire.

Sixty-six holograph letters, 1850 and undated, written to A. C. Ramsay. The writers include H. T. de la Beche (to Beete Jukes) (a testimonial to the recipient), [Charlotte A. M. Cookman], Monart House (attendance at a ball and archery meetings), Henry J. G. Fitzgerald, Friars, near Beaumaris ( Anglesey Hunt Week), E. W. Fitz Gerald, Fryars (personal), Emily M. Forbes, London (personal), Augusta Jukes, from Ffestiniog, Llangollen, etc. ( impressions of Yspytty Evan, prospects of a professorship at [Trinity College] Dublin for the writer's husband, the inhospitability of Merioneth people, personal), J. Beete Jukes (a professorship at Dublin, the writer's geological survey in North Wales), Lyon Playfair (the affairs of [Thomas] Oldham with reference to the Indian survey, matters at the Museum) (letterhead of the Great Exhibition of the Works of Industry of All Nations, 1851), M. E. P[layfair] (the writer's visit to the Continent, preparations for the Exhibition, the recipient's account for the 'Liverpool Works', personal), E. Ramsay, his mother, Glasgow (personal, news of geologist friends and others, comments on the Roman Catholic religion), Eliza Ramsay, his sister, G[lasgow] (personal, news of family and friends), J. C. Ramsay, from London, Valenciennes, and Antwerp (personal, news of friends, impressions of the writer's visit to the Continent and his meetings with sugar producers), W. ('Willie') Ramsay, Glasgow (the loss of the 'Orion', the plight of the Commercial Exchange, correspondence with Mr. James Brown of Ebbow Vale Iron Works, personal), J. Sharpe [from Glasgow] (personal, news of friends), Amelia Elizth. Williams [from Llandovery] (an invitation ), Anna Maria Williams, Llandovery (news of family and friends, the appearance of Wombwell's menagerie at Llandovery fair, the progress of the school building, the prevalence of consumption in Mothvey, Cillycwm is a 'perfect Lazaretto'), W. R. S[teuart] W[illiams], Welshpool and Llandovery (news of family and friends, the writer's activities, a flood at Llandovery ), etc. Also bound in the volume are thirteen holograph letters, 1852-1853 and undated, marked 'Private', to A. C. Ramsay. The writers include A. S. Jervis [from London] (relating to an anonymous letter), 'Betha' Johnes, Dolaucothy, etc. (Mrs. Ramsay's illness, news of friends), Cath[erin]e Ramsay [from Glasgow] (the birth of recipient's child), E. Ramsay, his mother, Hellensburgh, etc. (personal, news of friends), J. C. Ramsay, Demeraire, etc. (the selection of exhibits for the Crystal Palace Company, the birth of recipient's child, prospects of employment in the sugar industry, beetroot manufacture in Ireland, the extension of recipient's survey to Scotland, a request for books), W. Ramsay (the birth of recipient's child), etc.

'Geirlyfr William Lleyn'; 'Bardhoniaeth ... William Middelton'; pedigrees and arms, mainly of North Wales families; 'cywyddau', 'awdlau', etc. by Adda Fras, Iolo Goch, Maredudd ap Rhys, Robin Ddu, Rhys Nanmor, Gwilym ab Ieuan Hen, Dafydd Gorlech, Tudur Aled, Gruffudd ab Ieuan ab Llywelyn Fychan, Wiliam Llŷn, Sion Cent, Sion Tudur, Thomas Prys, Lewis Menai, Gruffudd Phylip, Richard Cynwal, Edmwnd Prys, Wmffre Dafydd ab Ifan, Wiliam Phylip, Sion Bryncir, Siôn Phylip, Richard Phylip, Sion Dafydd Lâs [John Davies], Watcyn Clywedog, Mor[u]s Dwyfech [Morus ap Dafydd ab Ifan ab Einion], Huw Lewis, Dafydd ap Hwlcyn ap Madog, Rhisiart Brych, Dafydd Jones ('Ficer Llanfair-Dyffryn-Clwyd'), Owen Gruffydd, Sion Lleyn [John Roberts], Taliesin, Rhys Goch Eryri, Dafydd Llwyd ap Llywelyn ap Gruffudd, Sion Roger, Sypyn Cyfeiliog [Dafydd Bach ap Madog Wladaidd], Bedo Brwynllys, Mathew Owen, Edward Morus, Huw Mor[y]s, Ieuan Dew Brydydd, Huw ab Ifan, Robert Davies (Nantglyn), Robin ab Iorwerth, Rolant Huw (Graienyn), Dewi Wyn [o Eifion] [David Owen], Griffith William (Braichtalog), Goronwy Owen, John Thomas (Pentrefeidiog) [i.e. Pentrefoelas], M[organ] D[avies], Griffith Puw, Dafydd Jones ('Tailiwr'), William ab Edward ('o'r Bennar'), Thomas Edwards ['Twm o'r Nant'], Lewis Morris, Ieuan Llwyd [Brydydd], Rhys Llwyd [Pant-y-piod], Rolant [Rowland] Jones (Pandy) [Roli Penllyn], Hugh Jones (Llangwm), John Jones [Jac] (Glan y Gors) and W[illiam] Jones [Bardd Môn]; 'englynion' by several authors; material relating to persons and places in Merioneth.