Papurau gwleidyddol Ieuan Wyn Jones, 1964-2015, gyda'r rhan fwyaf o'i gyfnodau fel Aelod Seneddol ac Aelod Cynulliad dros Ynys Mon, gan gynnwys gohebiaeth ar bynciau gwahanol, papurau etholaethol, papurau yn ymwneud a Phlaid Cymru, arweinyddiaeth Plaid Cymru llywodraeth clymblaid Cymru'n Un.

Papurau Undeb Cymru Fydd, yn cynnwys cofnodion, 1939-1966, gohebiaeth, 1944-1955, a chofnodion eraill y Cyngor, 1945-1963; papurau'n ymwneud â Phwyllgor Amddiffyn Diwylliant Cymru a ffurfio Undeb Cymru Fydd, 1939-1942; cofnodion a phapurau'r Pwyllgor Gwaith, 1943-1969; cofnodion ariannol, 1939-1970, yn cynnwys papurau'r Pwyllgor Ariannol, 1957-1966; cofnodion yn ymwneud â Phwyllgor Cronfeydd Deddf yr Eglwys yng Nghymru, 1953-1970; papurau'n ymwneud â'r Pwyllgor Llyfrau a chyhoeddiadau gan gynnwys Yr Athro a' calendr, 1944-1970; papurau Pwyllgor y Merched a Llythyr Ceridwen, 1955-1969; cofnodion amrywiol ganghenau, 1940-1956; papurau'n ymwneud â'r cynadleddau blynyddol, 1939-1964; papurau a gohebiaeth gyffredinol o'r brif swyddfa, 1941-1970; papurau, 1942-1948, a chofnodion, 1943-1947, Cyd Bwyllgor Undeb Cymru Fydd a'r Eglwysi; torion o'r wasg, 1939-1952; atebion i holiadur 'Ymchwil Undeb Cymru Fydd i Gyflwr Bywyd Cymdeithasol Cymru', 1943; papurau'n ymwneud ag ymgyrch Senedd i Gymru, 1950-1957; papurau'n ymwneud â materion ynglŷn â'r cyfryngau ac ymgyrchoedd, 1945-1963; papurau ynglŷn â'r iaith Gymraeg, yn enwedig mewn perthynas ag addysg, 1947-1964; papurau'r Pwyllgor Addysg, 1944-1963; papurau'n ymwneud ag Eisteddfodau Cenedlaethol, 1947-1968; papurau'n ymwneud â meddiannu tir gan y llywodraeth (Mynydd Epynt, Tryweryn, a thiroedd eraill) ac ynghylch dŵr, 1940-1958; copïau o Cofion Cymru, 1941-1946; copi llawysgrif y gyfrol Undeb Cymru Fydd 1939-1960 (1960) gan T. I. Ellis; a llythyrau at Ymddiriedolaeth Undeb Cymru Fydd. = Papers of Undeb Cymru Fydd, including minutes, 1939-1966, correspondence, 1944-1955, and other records, 1945-1963, of the Council; papers relating to Pwyllgor Amddiffyn Diwylliant Cymru and the formation of Undeb Cymru Fydd, 1939-1942; minutes and papers of the Executive Committee, 1943-1969; financial records, 1939-1970, including papers of the Financial Committee, 1957-1966; records relating to the Welsh Church Act Funds Committee, 1953-1970; papers relating to the Books Committee and publications including Yr Athro and the calendar, 1944-1970; papers of the Women's Committee and Llythyr Ceridwen, 1955-1969; records of various branches, 1940-1956; papers relating to the annual conferences, 1939-1964; general papers and correspondence from the main office, 1941-1970; papers, 1942-1948, and minutes, 1943-1947, of the Joint Committee of Undeb Cymru Fydd and the Churches; press cuttings, 1939-1952; replies to the questionnaire 'Ymchwil Undeb Cymru Fydd i Gyflwr Bywyd Cymdeithasol Cymru' (Survey of the condition of social life in Wales), 1943; papers relating to the Parliament for Wales campaign, 1950-1957; papers relating to media issues and campaigns, 1945-1963; papers concerning the Welsh language, particularly in relation to education, 1947-1964; papers of the Education Committee, 1944-1963; papers relating to the National Eisteddfodau, 1947-1968; papers relating to government requisition of land (Mynydd Epynt, Tryweryn, and other land) and water issues, 1940-1958; copies of Cofion Cymru, 1941-1946; manuscript of the volume Undeb Cymru Fydd 1939-1960 (1960) by T. I. Ellis; and letters to the Undeb Cymru Fydd Trust, 1967-1991.

Papers of Cymru Yfory/Tomorrow's Wales, including correspondence, administrative papers, publications and copies of evidence submitted to the All Wales convention, copies of lectures, speeches and campaigning material.

Miscellaneous essays and poems by John Davies, including 'Llethi: Afonig Llanarth Ceredigion: yn cynnwys Cofion boreu ac Adfyfyrdodau', 1863; 'Ar weled Adar yn codi ac yn disgyn o'm blaen ar ffordd Crook, Llanfyrnach, ar gurwlaw trwm, Medi 15, 1864'; 'Canu Da', 1863; 'Addysg Teuluaidd'; school exercise books of John Davies, 1822-1823; notes on ecclesiastical history; 'Translations of the Bible'; 'Canu'; 'Y Ddiaconiaeth a Threth y Llyfrau'; 'Y manteision a ddeilliant i Gymru oddiwrth ei Hundeb dan goron Lloegr'; an obituary notice of the Reverend John Williams of Bullocksmith, Cheshire; 'Dilanwadau Dwyfol', 1832; and poems and prayers by William Richards, Llanwinio, 1841-1847.

The third of three volumes containing some one hundred and eighty-eight letters, 1856-1888, addressed to Henry Richard and dealing particularly with politics, the peace movement, education and other affairs in Wales.
The correspondents include Sir Wilfrid Lawson, Leone Levi, W. F. Maitland, John Matthews (Aberystwyth), Edward Miall, Sir George Osborne Morgan, Samuel Morley, Sir Lewis Morris, William Morris (Kelmscott), A. J. Mundella, Thomas Nicholas, R. Barry O'Brien, Sir Hugh Owen, Frédéric Passy, Auguste Pierantoni, Lyon Playfair, Sir Henry Ponsonby, J. H. Puleston, Alexander Raleigh, Stuart (afterwards baron) Rendel, James H. Rigg, Sir Owen Roberts, Lady Frances Russell, G. W. E. Russell, Pietro Sparturo (Naples), John Poyntz [Spencer], fifth earl Spencer, Herbert Spencer, Edward Lyulph [Stanley], fourth baron Stanley of Alderley and fourth baron Sheffield, W. Co[w]per Temple, J[ohn] Thomas (editor of Y Tyst Cymreig), Jos[eph] Thompson, G. O. Trevelyan, Cypri[e]n Valton (Turin) and J. Carvel Williams.

A manuscript volume, [1747x1748], written by an unidentified scribe, entitled 'A Catalogue of the Representatives in Parliament for the Counties & Boroughs In Wales From the first returns of them A[nn]o 1542 to this present Parliament Conven[e]d A[nn]o 1747' (f. 4), listing the Members of Parliament of all county and borough seats in Wales, with the exception of Monmouthshire and Monmouth (ff. 5-62).
The seats are listed alphabetically by county with MPs then listed chronologically by monarch and regnal year; the Parliaments of the Commonwealth and Protectorate periods are omitted.

Papers, 1644-1691, accumulated by members of the Herbert family of Cherbury during the course of their political activities. They include records and correspondence, 1644-1658, relating to the family’s role in the civil war throughout Wales, and their subsequent dispossession and rehabilitation; records and correspondence, 1660-1689, concerning the Montgomeryshire militia and the suppression of disaffected persons in the Welsh marches; and records and correspondence, 1660-1691, relating to the family’s support of Charles II and James II, including military service in France.

Miscellaneous papers and correspondence of the families of Jones and Panton of Plas Gwyn, Price of Derwen, John Jones, dean of Bangor, and Evans of St. Asaph, [17 cent.]-1764, with transcripts of two earlier documents (a precept from Llewelyn ab Iorwerth to Madog ap Maelgwn and others, to protect the property of Walter Corbet in Rotelincope and Cotes, Shropshire, and a statement, 1461, of the privileges of Dinmael). The papers include a pedigree of Price of Derwen, 1681; a list of presents to William Jones of Pentraeth when sheriff of Anglesey, 1694; a list of the children of Rowland Jones (d. 1699); correspondence between John Jones, dean of Bangor, and Lady Bulkeley, 1696, Owen Lloyd, Rowland Jones, and Lord Bulkeley, 1710; minutes of general meetings for assessments at Llangefni, 1699-1710; particulars of land near Rhuddlan; a statement by Robert Lloyd of the misdemeanors of David Middelton; a statement on the government of Wales; a memorial by John Price of Derwen concerning lands in the lordship of Ruthin; letters from John Price of Llwyngwern to his son John Price of Derwen, 1703-1706, and letters from J. Vaughan, Kefnbodig, 1710, John Ellis of Bodlew, 1716, and William Wynne of Ruthin, 1717; advice by Humphrey Humphreys to Robert, Lord Bulkeley; correspondence of William Jones, recorder of Beaumaris, including a letter from Cadwaladr Williams (concerning the funeral of Lord Bulkeley, 1724); counsel’s opinion on the will of Richard Anwyl, 1704; a warrant and instructions to Edward Griffith of Bagillt concerning the impressing of seamen in North Wales, 1706; particulars of ships to be employed under Sir Robert Maunsfield against pirates, 1707; papers relating to a memorial against the demolition of Beaumaris Castle and other actions by Lord Bulkeley, 1709; correspondence between Lord Bulkeley and John Evans, bishop of Bangor, 1710; correspondence of Thomas Evans, vicar of St. Asaph, including letters from John Wynne, bishop of St. Asaph, 1716-1727, Sir John Price, Newtown, 1729-1730, Hugh Ffoulkes, Chester, 1726, Ken. Eyton, 1728, Francis Hare, bishop of St. Asaph, 1730-1731, and Thomas Tanner, bishop of St. Asaph, 1733; directions for the study of law by Justice Reaves and Nathaniel Cole, 1736; particulars of the estate of James, Lord Bulkeley, to be sold, 1747; an inscription on the tomb of Henry White of the Friars (d. 1728); a record of ships at Beaumaris, 1755, 1757-1758; a copy of an Act of Parliament confirming the patent of the Skerries Lighthouse to William Trench, 3 Geo. II; correspondence, 1759, between Paul Panton and Lewis Lloyd, Charles Pigot, Captain Hill, and Thomas Myddelton, Prescot, and an account of coal consumed at the lighthouse; papers relating to the career of Paul Panton: admission to chambers at Lincoln’s Inn, 1748, call to the bar, 1749, and statement of fees received, 1751-1752; a letter from George Prescott [?re Paul Panton], 1748; a letter from J. Mostyn concerning Talargoch, 1761; papers relating to the preferments of Evan Evans (Ieuan Fardd): licence and declaration of conformity as curate of Manavon, 1754, letters testimonial to the Bishop of Bangor and a letter from John Morgan, 1758, letters testimonial to the Bishop of St. Asaph, and letters relating to his curacy at Llanfair Talhaiarn, 1761, and a letter from S[amuel Squire], bishop of St. Davids, 1764; a letter from Tho[mas Herring], bishop of Bangor, to the Chancellor relating to the election of a Master of Beaumaris School, 1740; a copy of a letter from John Price of Buckland to Mrs. Bostock, 1748, asking her to use her powers to raise his wife from the dead; a letter from William Lewis, Llysdulas, to Sir William Irby, 1749; a letter from Edward Orme to [?Paul Panton], 1757; and miscellaneous papers relating to legal proceedings.

Transcripts of 'A Dialogue of the praesent Government of Wales ... 1594' (from British Museum Harleian MS. 141) and of Cruell Laws against Welshmen (from Phillipps MS 21769 at the Cardiff Public Library) by George Owen (see The Description of Pembrokeshire, Part III. pp. 1-126).

The second of three volumes containing some one hundred and eighty-eight letters, 1856-1888, addressed to Henry Richard and dealing particularly with politics, the peace movement, education and other affairs in Wales.
The correspondents include Henry Fawcett, (Mrs) M. G. Fawcett, Dudley Field, Hugh Fielden, Lord [Edmond] Fitzmaurice, W. E. Forster, W. H. Fremantle, Joseph F. B. Frith, Thomas Gee, H. M. Milner Gibson, J. H. Gladstone, W. E. Gladstone, Granville George [Leveson-Gower], second earl Granville, John Griffith (Y Gohebydd), Lord Richard Grosvenor, first baron Stalbridge, George Hadfield, John Hampden (Croydon), Sir William Harcourt, H. D. Harper (Jesus College, Oxford), Thomas Harris, Arthur Hobhouse, Alfred Illingworth, Basil M. Jones, J. Viriamu Jones and Michael D. Jones.

An interleaved copy of W. R. Williams, The Parliamentary History of the Principality of Wales..., 1541-1895 (Brecknock, 1895) with copious manuscript additions and corrections in the hand of the author, [c. 1912], in preparation for a projected second edition.
Deletions and minor corrections were generally made directly to the original text with more substantial changes supplied on the interleaves opposite. Among the main additions are details of elections, 1895-1910. There are a few further additions to the List of Subscribers (pp. 213-218) up to about 1919. Three items found in the volume have been loosely inserted opposite pp. 77 and 78.

File contains election addresses and other material distributed in Wales during the 2017 General Election campaign, but which was not targeted to a particular constituency.

The first of three volumes containing some one hundred and eighty-eight letters, 1856-1888, addressed to Henry Richard and dealing particularly with politics, the peace movement, education and other affairs in Wales.
The correspondents include Sheldon Amos (Sydney, New South Wales), Henry Austin Bruce, first baron Aberdare, Elihu Burritt (New Britain, Conn.), Josephine E. Butler, Sydney Charles [Buxton], earl Buxton, Estlin Carpenter, Joseph Chamberlain, F. W. Chesson, J. J. Colman (Norwich), Leonard Courtney, John Stewart [Gathorne-Hardy], second earl of Cranbrook, Henry W. Crosskey, R. W. Dale, Edward Henry [Stanley], fifteenth earl of Derby, Charles W. Dilke, L. L. Dillwyn, George Dixon, Henry T. Edwards (dean of Bangor), Lewis Edwards (Bala) and Thomas Charles Edwards (Aberystwyth).

Papers, correspondence and press cuttings relating to Ireland, 1926-1978; Plaid Cymru, 1929-1965; Welsh political, economic and social affairs, 1931-1962; Pantybeiliau Folk School, 1933-1938; world economics, socialism and communism, 1934-1951; and Brittany, 1946; and personal papers, including correspondence, 1924-1978, diaries, 1921-1979, and academic papers, 1922-1946.

A roughly-bound composite volume of notebooks in the hand of J. H. Davies containing extracts and transcripts from seventeenth and eighteenth century public records relating mainly to Cardiganshire and taken especially from Gaol Files, 1732-69 (among them 'Quotations sent to Welsh Gazette' with captions in the hand of George Eyre Evans); and copious extracts and transcripts of seventeenth century Welsh Puritan and Quaker interest, including material from Merioneth Gaol Files, temp. Charles II, notes and extracts on 'Personalia' (with similar material relating to Dafydd ap Gwilym etc.); an extensive list of titles of, with extracts from, printed books and Acts of Parliament, a list of Members of Parliament for Welsh constituencies, 1640-60 (Cardiganshire from 1624), transcripts from Thomas Shankland, '"Diwygwyr Cymru" Beriah Gwynfe Evans', Seren Gomer 1901, passim, etc. There is a classified index at the end of the volume.

Papers relating to the donor's work as Clerk of the National Assembly and Chair of the Commission on Devolution in Wales.

The archive comprises the papers of Jill Evans, mostly produced and accumulated in the course of her work as a Member of the European Parliament for Plaid Cymru between 1999 and 2020 and include material relating to various campaigns on employment, the environment, women's issues, food standards, international development, the Iraq war, the Welsh language and Catalonia.

Papers of former Welsh Labour & Co-operative politician Don Touhig, Baron Touhig, comprising material relating to his political career both before and after his 1995 Islwyn by-election victory, and including campaign publicity; speech notes; parliamentary reports; diaries; and correspondence.

Over two hundred letters, 1898-1915, and related papers, [c. 1904]-[c. 1919], of David Lloyd George, 1st earl Lloyd George of Dwyfor. The bulk of the correspondence is addressed to Lloyd George but there are also a few notes in Lloyd George's hand. Most of the letters relate to Welsh affairs, and in particular to the Disestablishment question and the contentious Welsh Church Commission, 1906-1907; other subjects include education, the investiture of the Prince of Wales, 1911, and the First World War. For the most part the correspondents are Welsh politicians and public figures; there are also letters from the 1st earl of Halifax (1) 1914, Randall Davidson, archbishop of Canterbury (1) 1906, and Herbert Gladstone (2) 1907-1910. The main correspondents are A.G. Edwards, bishop of St Asaph (5) 1906-1915, Sir Francis Edwards, MP (18) 1903-1915, Sir Samuel T. Evans, MP (6) 1907-1908, Sir Henry Jones (8) 1906-1907, Sir J. Herbert Lewis, MP (5) 1906-1907, Sir J. Herbert Roberts, MP (9) 1906-1907, and W. Llewelyn Williams, MP (21) 1906-1915.

Letters, newspaper cuttings, notes, pamphlets and periodicals, typescripts, reports, volumes of parliamentary debates, and other papers of James Griffiths relating to the following: the coal industry and the South Wales Miners' Federation, 1912-1967; the Labour Party, 1919-1975; the Central Labour College, 1919-1922; National Insurance, 1931-1954; the Colonies, 1939-1972; his work as Secretary of State for Wales, 1964-1966; papers relating to Welsh affairs including devolution, the Welsh Reconstruction Advisory Council, education and local government reorganization, 1935-1975; constituency affairs, 1937-1969; overseas visits, 1936-1968; the Nigeria-Biafra War, 1968-1970; papers relating to his autobiography Pages from Memory, including letters from Gwilym Prys Davies and others, 1961-1969, notebooks, [1960s], typescripts, [1964]-1969, and cuttings of reviews, 1969; unpublished reminiscences, 1955-1974; notes and typescripts for lectures and speeches, 1940-1971; typescripts of broadcasts by Griffiths, 1937-1967; typescripts of articles and reviews, 1940-1974; newspaper cuttings, 1919-2000; and other miscellaneous personal matter, [1930s]-2000; and papers relating to Mrs Silyn Roberts, 1897-1954.