Comprises Gwilym Prys-Davies' political papers, 1954-2008, including letters, articles, minutes and reports, as well as subject files, 1912-2012, and letters between Harri Webb and John Legona and some papers relating to William Abraham (Mabon). The papers relate mainly to devolution, Welsh language legislation, language rights and contain files relating to the Welsh Republican Movement and civil rights group Cefn.
Papers relating to the funeral of Gwilym Prys Davies, 8 April 2017, comprising the order of service, tributes and a booklet containing family photographs; April 2017.
Five letters, 2005-2006, from Gwilym Prys Davies to Prys Davies and Meri Huws of the Welsh Language Board, together with three attached documents; September 2018.

Miscellaneous twentieth century pamphlets and leaflets of political interest, [1934]-[1987], many relating to Plaid Cymru and nationalist groups, collected by J. E. Jones, secretary and organiser of Plaid Cymru, 1930-1962, including some manuscript notes by him and publications by him. = Pamffledi a llyfrynnau amrywiol o'r ugeinfed ganrif o ddiddordeb gwleidyddol, [1934]-[1987], nifer ohonynt yn cyfeirio at Blaid Cymru a grwpiau cenedlaethol, wedi eu casglu ynghyd gan J. E. Jones, Pwllheli, ysgrifennydd a threfnydd Plaid Cymru, 1930-1962, gan gynnwys nodiadau llawysgrif ganddo a chyhoeddiadau ganddo..

Correspondence relating to the No Assembly Campaign, 1979; press releases, speeches, and articles, 1979; miscellaneous administrative papers, 1978-1979; and press-cuttings, 1979.

Papers of the Wales for the Assembly campaign, 1975-1979, including minutes, correspondence and papers of the Wales for the Assembly Action Committee and Research Sub-committee, 1976-1977; minutes of the Campaign's committee meetings, 1978-1979; pamphlets and leaflets, 1979; publicity and speeches, 1978-1979; correspondence, 1975-1979; press statements, 1979; and miscellaneous papers, 1978-1979.

Nodiadau darlithoedd, yn bennaf ar gyfer dosbarthiadau allanol ar hanes Cymru, 1943-1975; papurau ynglŷn ag ymchwil a chyhoeddiadau Frank Price Jones, 1947-1975, yn cynnwys drafftiau erthyglau ac adolygiadau, gwahanlithoedd a chopïau printiedig o'i waith cyhoeddedig; deunydd yn ymwneud ag erthyglau awduron eraill, 1932-1975; papurau, 1943-1975, yn deillio o waith Frank Price Jones ar gyfer y cyfryngau, y cynnwys sgriptiau radio a theledu, ac i bapurau newydd; papurau gwleidyddol, 1910-1975, yn cynnwys gohebiaeth, torion o'r wasg, pamffledi ymgeiswyr ac anerchiadau etholiadol, canlyniadau etholiadau, deunydd yn ymwneud ag Ymgyrch Senedd i Gymru yn y 1950au cynnar a Chomisiwn y Cyfansoddiad, 1969-1970; papurau, 1947-1975, ynghylch y gwaith cyhoeddus a gyflawnodd Frank Price Jones, yn cynnwys deunydd yn ymwneud â'r Eisteddfod Genedlaethol, 1922-1974; deunydd, 1966-1975, yn ymwneud â Phatagonia; papurau,1966-1975, yn deillio o waith Frank Price Jones ar gyfer Panel Cyfieithu'r Swyddfa Gymreig, Pwyllgor Amgueddfa Werin Cymru, 1956-1967, ac Urdd y Graddedigion Prifysgol Cymru, 1963-1975; gohebiaeth gyffredinol, 1941-1975, yn cynnwys grŵp mawr o lythyrau,1941-1975, oddi wrth Iorwerth C. Peate, cefnder Frank Price Jones; ac amrywiol. = Lecture notes mainly for extra-mural classes in Welsh history, 1943-1975; papers concerning Frank Price Jones's research and publications, 1947-1975, including drafts of articles and reviews, offprints and printed copies of his published work; material relating to articles by other authors, 1932-1975; papers, 1943-1975, deriving from Frank Price Jones's work for the media, including television and radio scripts, and for newspapers; political papers, 1910-1975, including correspondence, press cuttings, candidates' pamphlets and election addresses, election results, material relating to the Parliament for Wales Campaign of the early 1950s and to the Commission on the Constitution of 1969-1970; papers, 1947-1975, concerning the public work undertaken by Frank Price Jones, including in relation to the National Eisteddfod, 1922-1974; material, 1966-1975, relating to Patagonia; papers, 1966-1975, deriving from Frank Price Jones's work for the Welsh Office Translation Panel, the Committee of the Welsh Folk Museum, 1956-1967, and for the Guild of Graduates of the University of Wales, 1963-1975; general correspondence, 1941-1975, including a large group of letters, 1941-1975, from Iorwerth C. Peate, a cousin to Frank Price Jones; and various miscellanea.

Papers, 1886-1968, of the Lloyd George family. The collection is comprised mainly of correspondence, the bulk of which is addressed to David Lloyd George, mostly from contemporary political figures and from members of his family. The political correspondence relates largely to Welsh affairs, including Disestablishment, the Welsh Church Commission, education and the investiture of the Prince of Wales in 1911, as well as to the Irish Question and the First World War. David Lloyd George's family correspondence includes letters, [c. 1886]-1941, between David Lloyd George and his wife Margaret, from David Lloyd George to his uncle Richard Lloyd, 1890-1916, and to David Lloyd George from his brother William George, 1891-1915; other family correspondence includes letters to Margaret Lloyd George, 1893-1939, from various correspondents, and from Margaret Lloyd George mainly to her daughter Olwen Carey-Evans, 1917-1939; correspondence and papers of Megan Lloyd George, daughter of David and Margaret Lloyd George, including letters, 1939-1957, to and from Labour politician Philip Noel-Baker and from other correspondents, 1910-1966, including her parents, together with a tour journal, 1923-1924, and diary, 1947, and correspondence and papers, 1914-[c. 1963], of Gwilym Lloyd George, son of David and Margaret Lloyd George, including a typescript draft, [c. 1960]-1962, of his (unpublished) autobiography; together with speech notes, notebooks and miscellaneous papers, [c. 1904]-1939, of David Lloyd George, and correspondence and papers, 1898-1909, relating to Mair Eluned Lloyd George, daughter of David and Margaret Lloyd George.