Early years and education at University College Dublin including Secretary and Auditor of the Literary & Historical Society (1899–1902); Secretary and member of the Catholic Graduates’ and Undergraduates’ Association (1901–6); editor of St Stephen’s—a record of university life (1901–2); membership of the Gaelic League (1899–1908), Celtic Association (1901) and the Irish National Theatre Society (1903); letters received from Francis Sheehy Skeffington (1904–6) and Tom Kettle ([1904]–7); activities such as fund collection for famine-stricken victims in the winter of 1897–8 and material relating to a protest at the playing of the British anthem at conferrings in UCD (1905).

Early legal career as a barrister: correspondence with solicitors concerning briefs, related notes and briefs (1902–24); King’s Counsel and Bencher of King’s Inns (1920–2).

Legal Adviser at the Anglo-Irish Treaty negotiations and Law Officer to the Provisional Government: mainly material relating to the transfer of power and services and the establishment of the position of Governor General; correspondence with D. Lloyd George (Prime Minister), Winston Churchill (Secretary of State for the Colonies), Alfred W. Cope (Assistant Under Secretary), Francis N. Greer (Irish Office), Sir Frederick Liddell (Office of the Parliamentary Counsel) and related memoranda (1921–2); Conference on Ireland (1922) and Cabinet Committee on Irish Affairs and Technical Sub-Committee (1922).

Material relating to the establishment, functioning and activities of the Provisional Government including correspondence with Michael Collins (Chairman and Commander-in-Chief), William T. Cosgrave (Acting Chairman), Eamon Duggan (Minister for Home Affairs), Patrick Hogan (Minister for Agriculture); with the Postmaster General, Accountant General and Chief State Solicitor; correspondence with departmental secretaries in relation to external affairs, finance and economic affairs; related memoranda (1922).

Material relating to the Civil War and the destruction of the Four Courts including the Public Record Office (1922) and to the deaths of Michael Collins and Arthur Griffith (1922).

Constitution Committee: correspondence of committee members mainly between Kennedy, Darrell Figgis (Chairman), R.J.P. Mortished (Secretary) and James Douglas (1922); correspondence between Kennedy and William T. Cosgrave (Chairman and Acting Chairman of the Provisional Goverment) (1922–3); committee working drafts of three versions of the Constitution with amendments and annotations; related working papers and official memoranda (1922) including memoranda by Eoin MacNeill, Patrick Hogan, William T. Cosgrave, George O’Brien, Lord Midleton and Timothy M. Healy; details of public reaction and parliamentary questions and amendments (1922–3); negotiations with the British government including telegrams from and correspondence with officials in the Colonial Office, Home Office and Irish Office (1922); Conference on Ireland (1922); Kennedy’s working notes and memoranda (1922).

Provisional Government and Executive Council policy on the North Eastern counties with details of relations including letters from [7th Marquess of Londonderry] (1922); memoranda and letters on the position of Roman Catholic teachers (1922–3). North-East Boundary Bureau: memoranda relating to its work mainly from Kevin O’Shiel (Director) and correspondence between O’Shiel and members of the Executive Council (1922–3); pamphlets published by its Publicity Department (1922–4). Boundary Commission: correspondence between Kennedy and the Colonial Office (1922–4) and between Kennedy and William T. Cosgrave (President, Executive Council) and related memoranda and notes by Kennedy (1924); letters and memoranda relating to the Boundary Commission Conference (1924) and related series of reference files prepared by the North-East Boundary Bureau for members of the Irish delegation (1924).

Provisional Government and Executive Council policy on compensation: letter and memorandum from Joseph Brennan (Minister for Finance) (1922). Compensation (Ireland) Commission: dispatches and correspondence between Kennedy and Eamon Duggan (Minister for Home Affairs), Michael Collins (Chairman, Provisional Government), Michael Corrigan (Chief State Solicitor), James C. Dowdall (Commissioner), Winston Churchill (Secretary of State for the Colonies) and officials in the Ministry for Economic Affairs and Colonial Office concerning terms of reference, apportionment of liability and appointment of Commissioners and related memoranda (1922–4).

Material relating to Post-Truce compensation, the Damage to Property (Compensation) Act and to criminal and malicious injuries claims (1922–4); War Compensation Court (1922–4) and the Committee on Compensation Awards (1925).

Attorney General, Irish Free State: correspondence on a wide range of issues and concerns with the Cabinet Office (1923), Colonial Office (1923–4), Office of the Parliamentary Counsel (1923), Office of the Irish High Commissioner, London (1923–4), Governor General, Irish Free State (1922–4) and related memoranda from Irish Free State government offices.

Executive Council : its formation including the Ministers and Secretaries Act (1924), meetings (1923–4), correspondence between Kennedy and William T. Cosgrave (President, Executive Council); draft letters and speeches prepared by Kennedy for Cosgrave on many issues including Anglo-Irish matters and the conflict with the Irregulars (1922–4).

Office of the Attorney General: notes and memoranda by Kennedy, John A. Costello (Assistant Legal Adviser), Kevin O’Shiel (Assistant Legal Adviser), Arthur V. Matheson (Parliamentary Draftsman) on legal and legislative matters; correspondence with Michael A. Corrigan (Chief State Solicitor) and related memoranda (1922–3).

Correspondence between Kennedy and various ministers, departmental secretaries and officials mainly in the Army and Defence (1922–4), External Affairs (1922–4) including the Publicity Department, Finance (1922–4), Revenue Commissioners (1922–3), Home Affairs (1922–4), Industry and Commerce (1923–4), Agriculture (1922–4), Land Commission (1923), Fisheries (1923–4), Local Government (1923–4), Office of Public Works (1924), Land Registry (1923–4), Valuation Office (1923), Clerk of Crown and Hanaper (1922), Office of Arms (1922) and Commissioners for Charitable Donations and Bequests (1924) on various policy, procedural and legal matters and concerns.

Dáil Éireann funds: correspondence between George McGrath (Accountant General) and James O’Connor (Counsel for the Irish Free State) (1922–4); transcripts of related proceedings in the New York Supreme Court (1922–[1927]) and of the Dublin Commission (1923–4) including details of plaintiffs’ exhibits ([1919]–1923) and reference material for counsel and for the plaintiffs ([1919]–1924).

Constitution of the Irish Free State: notes by Kennedy and memoranda examining the implications of the Constitution and related correspondence (1923–4) including letters about its interpretation (1922–4).

League of Nations: preparation of the application for admission by the Irish Free State, subsequent admission and attendance by its delegation at the Fourth Assembly (1923); proposed registration of the Anglo-Irish Treaty (1923), letters and dispatches from the Colonial Office (1923–4); letters to Kennedy from Michael MacWhite (Irish representative accredited to the League of Nations (1923) and E. J. Phelan (International Labour Office) (1923–4).

Imperial Conference: memoranda and reports (1923).

Dáil Éireann: notes and draft documents by Kennedy relating to the nature of the Dáil and its work; standing orders; the Committee on Procedure (1922–3), finance bill procedure (1923–4), private bill procedure (1923–4), divorce bill procedure (1923–4), functions of the Speaker (1923–4); correspondence between Kennedy and Colm Ó Murchadha (Clerk of the Dáil), Michael Hayes (Ceann Comhairle) and Senator James Douglas and related memoranda on procedural matters; material relating to procedures in Seanad Éireann (1922–3) and to communications between both houses of the Oireachtas and related procedures (1922–3); oath and two-fold oath of allegiance (1921–3); parliamentary library (1923); first election under the Irish Free State (Agreement) Act, 1922 including proportional representation (1922–3); opening meetings of parliamentary sessions and addresses by the Governor General (1922–3).

Courts, judiciary and judicial reorganisation: accommodation matters in the aftermath of the destruction of the Four Courts ([1922]–1924), reopening of the courts in the Four Courts (1931); suspension of the Dáil Éireann courts and related legislation and Dáil Éireann Courts (Winding-Up) Commission (1922–3); matters relating to the Supreme Court of Judicature (1923–4), district courts and related legislation (1922–4).

Judiciary Committee: meetings and correspondence between Kennedy and Micheal Smidic (Secretary) and committee members (1923–4); committee working papers mainly memoranda by committee members and various members of the judiciary and legal profession (1922–3); draft and revised reports of the committee (1923); correspondence on judicial reform and on the committee’s report (1923).

Courts of Justice bill 1924: correspondence and proposals from government ministers, members of the legal profession (mainly District Justice Louis Walsh) and the public; notes and analysis by Kennedy; rules of court and the Rule-Making Authority appointed under the Courts of Justice Act 1924 (1923–6).

Design of judicial robes including correspondence between Kennedy, William Butler Yeats and Charles Shannon, RA; design sketches by Kitty MacCormack (Dun Emer Guild) for judicial robes (1923–6).

Material relating to the use of Irish and terminology in the courts (1923–7); Jurors and Juries (Amendment) Bill 1924 (1923–4), Criminal Justice (Administration) Bill 1924 (1924), Courts of Justice Bill (1934) (1935–6).

Chief Justice: correspondence between Kennedy and the Office of President of the Executive Council (1924–30), various ministries, the Attorney General, Ceann Comhairle, Senate members and religious figures (1925–36); cases and judgments (1926–9); correspondence between Kennedy and the Committee of the Executive Council on amendments to the Constitution (1926); material relating to the retirement of Timothy M. Healy as Governor General, installation of James McNeill and the installation of Domhnall Ó Buachalla and related crisis (1928–32).

International Commission under the Treaty of Conciliation between Romania and the United States of America (1930–1) and Second House Commission (1936).

Design of state seals (1922–8), Lane Bequest and the National Gallery (1923–6), material relating to archives, antiquities, treasure trove and the Gate Theatre (1923–34) including correspondence between Kennedy and Hilton Edwards (1923–34).

American Bar Association and Canadian Bar Association: visit to Dublin by members of both associations (1923–5), Kennedy’s membership (1925) and related visit by Kennedy to the United States of America and Canada (1926–9).

Cumann Na nGaedheal: party political material; correspondence between Kennedy and William T. Cosgrave (1922–3); election material including speeches by Kennedy and his election to Dáil Éireann in the Dublin city south by-election 1923 (1922–6).

Semi-official and personal correspondence including letters from William T. Cosgrave, Sir John and Lady Lavery, George Gavan Duffy, Alice Stopford Green, Crompton Llewelyn Davies, Lionel Curtis, Hal Blackall, Sir Francis N. Greer, E.J. Phelan, Thomas Bodkin (1921-33); correspondence relating to civil and post-war assistance and political and criminal prisoners including letters from Earl of Granard and Shane Leslie (1922–3); correspondence relating to legislative and national issues, positions, jobs and compensation, philanthropic and legal matters (1922–31).

Publications: drafts and correspondence relating to articles by Kennedy on the Irish Free State Constitution, Great Seal and judicial reorganisation (1923–4); correspondence between Kennedy and Dr Leo Kohn abut Kohn’s book Die Verfassung des Irischen Freistaats (1928) (1927–9).

Speeches, printed matter, photographs, family and personal papers including Kennedy’s diaries (1919–29) ([1851]–1937).