| • Science | • People | • Locations | • Timeline |
| Representative Peer | Elected | Replacing | Died | |
|---|---|---|---|---|
| Robert Agar, 1st Baron Rossmore | 2 August 1800 | 5 August 1801 | ||
| Robert Clements, 1st Earl of Leitrim | 2 August 1800 | 27 July 1804 | ||
| Otway Cuffe, 1st Earl of Desart | 2 August 1800 | 9 August 1804 | ||
| Francis Matthew, 1st Earl of Landaff | 2 August 1800 | 30 July 1806 | ||
| Lawrence Harman Parsons, 1st Earl of Rosse | 2 August 1800 | 20 April 1807 | ||
| John Thomas de Burgh, 13th Earl of Clanricarde | 2 August 1800 | 27 July 1808 | ||
| John Denis Browne, 1st Marquess of Sligo | 2 August 1800 | 2 January 1809 | ||
| Charles Agar, 1st Earl of Normanton | 2 August 1800 | 14 July 1809 | ||
| Henry Yelverton, 1st Baron Longueville | 2 August 1800 | 23 May 1811 | ||
| George Frederick Nugent, 7th Earl of Westmeath | 2 August 1800 | 30 December 1814 | ||
| John Crosbie, 2nd Earl of Glandore | 2 August 1800 | 23 October 1815 | ||
| Robert Howard, 2nd Earl of Wicklow | 2 August 1800 | 23 October 1815 | ||
| George Agar, 1st Baron Callan | 2 August 1800 | 29 October 1815 | ||
| Thomas Knox, 1st Viscount Northland | 2 August 1800 | 5 November 1818 | ||
| Richard Butler, 1st Earl Glengall | 2 August 1800 | 30 January 1819 | ||
| Robert Jocelyn, 2nd Earl of Roden | 2 August 1800 | 29 June 1820 | ||
| Robert Stewart, 1st Marquess of Londonderry | 2 August 1800 | 6 April 1821 | ||
| Charles O'Hara, 1st Baron Tyrawley | 2 August 1800 | 15 June 1821 | ||
| Richard Hely-Hutchinson, 1st Earl of Donoughmore | 2 August 1800 | 22 August 1825 | ||
| Hugh Carleton, 1st Viscount Carleton | 2 August 1800 | 25 February 1826 | ||
| John Creighton, 1st Earl of Erne | 2 August 1800 | 15 September 1828 | ||
| Thomas Taylour, 1st Marquess Headfort | 2 August 1800 | 24 October 1829 | ||
| Francis Bernard, 1st Earl of Bandon | 2 August 1800 | 26 November 1830 | ||
| Henry Conyngham, 1st Marquess Conyngham | 2 August 1800 | 28 December 1832 | ||
| Thomas Pakenham, 2nd Earl of Longford | 2 August 1800 | 24 May 1835 | ||
| Richard Bingham, 2nd Earl of Lucan | 2 August 1800 | 30 June 1839 | ||
| Charles Henry St John O'Neill, 1st Earl O’Neill | 2 August 1800 | 25 March 1841 | ||
| Edmund Henry Percy, 1st Earl of Limerick | 2 August 1800 | 7 December 1844 | ||
| Charles William Bury, 1st Earl of Charleville | 2 November 1801 | Robert Agar, 1st Baron Rossmore | 31 October 1835 | |
| John Willoughby Cole, 2nd Earl of Enniskillen | 13 October 1804 | Robert Clements, 1st Earl of Leitrim | 31 March 1840 | |
| Du Pre Alexander, 2nd Earl of Caledon | 26 November 1804 | Otway Cuffe, 1st Earl of Desart | 8 April 1839 | |
| Francis William Caulfeild, 2nd Earl of Charlemont | 12 December 1806 | Francis Matthew, 1st Earl of Landaff | 26 December 1863 | |
| George King, 3rd Earl of Kingston | 11 July 1807 | Lawrence Harman Parsons, 1st Earl of Rosse | 18 October 1839 | |
| Richard Le Poer Trench, 2nd Earl of Clancarty | 16 December 1808 | John Thomas de Burgh, 13th Earl of Clanricarde | 24 November 1837 | |
| Charles John Gardiner, 1st Earl of Blessington | 15 April 1809 | John Denis Browne, 1st Marquess of Sligo | 25 May 1829 | |
| Lawence Parsons, 2nd Earl of Rosse | 22 October 1809 | Charles Agar, 1st Earl of Normanton | 24 February 1841 | |
| Archibald Acheson, 2nd Earl of Gosford | 19 August 1811 | Henry Yelverton, 1st Viscount Lungueville | 27 March 1849 | |
| Stephen Moore, 2nd Earl Mount Cashell | 24 March 1815 | George Frederick Nugent, 7th Earl of Westmeath | 27 October 1822 | |
| James Maxwell, 2nd Earl of Farnham | 2 March 1816 | John Crosbie, 2nd Earl of Glandore | 23 July 1823 | |
| John Bourke, 4th Earl of Mayo | 2 March 1816 | Robert Howard, 2nd Earl of Wicklow | 23 May 1849 | |
| William O'Brien, 2nd Earl Thomond | 2 March 1816 | George Agar, 1st Baron Callan | 21 August 1846 | |
| Somerset Richard Butler, 3rd Earl of Carrick | 13 March 1819 | Thomas Knox, 1st Viscount Northland | 4 February 1838 | |
| Somerset Lowry-Corry, 2nd Earl Belmore | 5 May 1819 | Richard Butler, 1st Earl Glengall | 18 April 1841 | |
| James Stevenson Blackwood, 2nd Baron Dufferin | 7 October 1820 | Robert Jocelyn, 2nd Earl of Roden | 8 August 1836 | |
| Richard Wingfield, 5th Viscount Powerscourt | 3 August 1821 | Robert Stewart, 1st Marquess of Londonderry | 9 August 1823 | |
| William Howard, 4th Earl Wicklow | 10 November 1821 | Charles O'Hara, 1st Baron Tyrawley | 22 March 1869 | |
| Robert Edward King, 1st Viscount Lorton | 8 February 1823 | Stephen Moore, 2nd Earl Mount Cashell | 20 November 1854 | |
| John Evans-Freke, 6th Baron Carbery | 30 January 1824 | James Maxwell, 2nd Earl of Farnham | 12 May 1845 | |
| Charles Vereker, 2nd Viscount Gort | 30 January 1824 | Richard Wingfield, 5th Viscount Powerscourt | 11 November 1842 | |
| John Maxwell-Barry, 5th Baron Farnham | 17 December 1825 | Richard Hely-Hutchinson, 1st Earl of Donoughmore | 20 September 1838 | |
| Stephen Moore, 4th Earl Mount Cashell | 1 July 1826 | Hugh Carleton, 1st Viscount Carleton | 10 October 1883 | |
| Henry Sadlier Prittie, 2nd Baron Dunalley | 19 December 1828 | John Creighton, 1st Earl of Erne | 19 October 1854 | |
| Richard Butler, 2nd Earl of Glengall | 1 September 1829 | Charles John Gardiner, 1st Earl of Blessington | 22 June 1858 | |
| Hayes St Leger, 3rd Viscount Doneraile | 15 March 1830 | Thomas Taylour, 1st Marquess of Headfort | 27 March 1854 | |
| George Thomas John Nugent, 1st Marquess of Westmeath | 26 February 1831 | Francis Bernard, 1st Earl of Bandon | 5 May 1871 | |
| Ulysses Bagenal Burgh, 2nd Baron Downes | 30 March 1833 | Henry Conyngham, 1st Marquess Conyngham | 26 July 1863 | |
| James Bernard, 2nd Earl of Bandon | 31 July 1835 | Thomas Pakenham, 2nd Earl of Longford | 31 October 1856 | |
| Edward Wadding Plunkett, 14th Baron Dunsany | 18 January 1836 | Charles William Bury, 1st Earl of Charleville | 11 December 1848 | |
| Cornwallis Maude, 3rd Viscount Hawarden | 31 October 1836 | James Stevenson Blackwood, 2nd Baron Dufferin | 12 October 1856 | |
| Robert Dillon, 3rd Baron Clonbrock | 20 February 1838 | Richard Le Poer Trench, 2nd Earl of Clancarty | 4 December 1893 | |
| Charles William Bury, 2nd Earl of Charleville | 13 April 1838 | Somerset Richard Butler, 3rd Earl of Carrick | 14 July 1851 | |
| John Vesey, 2nd Viscount de Vesci | 19 January 1839 | John Maxwell-Barry, 5th Baron Farnham | 19 October 1855 | |
| Henry Maxwell, 7th Baron Farnham | 2 July 1839 | Du Pre Alexander, 2nd Earl of Caledon | 20 August 1868 | |
| Windham Henry Wyndham-Quin, 2nd Earl of Dunraven | 21 September 1839 | Richard Bingham, 2nd Earl of Lucan | 6 August 1850 | |
| Edward Crofton, 2nd Baron Crofton | 21 January 1840 | George King, 3rd Earl of Kingston | 27 December 1869 | |
| George Charles Bingham, 3rd Earl of Lucan | 22 June 1840 | John Willoughby Cole, 2nd Earl of Enniskillen | 10 November 1888 | |
| James Du Pre Alexander, 3rd Earl of Caledon | 8 May 1841 | Lawence Parsons, 2nd Earl of Rosse | 30 June 1855 | |
| Cadwallader Davis Blayney, 12th Baron Blayney | 12 June 1841 | Charles Henry St John O'Neill, 1st Earl O’Neill | 18 January 1874 | |
| Richard Handcock, 3rd Baron Castlemaine | 6 July 1841 | Somerset Lowry-Corry, 2nd Earl Belmore | 4 July 1869 | |
| John Bruce Richard O'Neill, 3rd Viscount O'Neill | 31 January 1843 | Charles Vereker, 2nd Viscount Gort | 12 February 1855 | |
| William Parsons, 3rd Earl of Rosse | 24 February 1845 | Edmund Henry Percy, 1st Earl of Limerick | 31 October 1867 | |
| John Crichton, 3rd Earl of Erne | 24 July 1845 | John Evans-Freke, 6th Baron Carbery | 3 October 1885 | |
| John Otway O'Connor Cuffe, 3rd Earl of Desart | 11 December 1846 | William O'Brien, 2nd Earl Thomond | 1 April 1865 | |
| Eyre Massey, 3rd Baron Clarina | 16 April 1849 | Edward Wadding Plunkett, 14th Baron Dunsany | 18 November 1872 | |
| John Cavendish Browne, 3rd Baron Kilmaine | 22 June 1849 | Archibald Acheson, 2nd Earl of Gosford | 13 January 1873 | |
| George John Danvers Butler, 5th Earl of Lanesborough | 14 August 1849 | John Bourke, 4th Earl of Mayo | 7 July 1866 | |
| Randall Edward Plunkett, 15th Baron Dunsany | 19 November 1850 | Windham Henry Wyndham-Quin, 2nd Earl of Dunraven | 7 April 1852 | |
| Denis St George Daly, 2nd Baron Dunsandle | 23 September 1851 | Charles William Bury, 2nd Earl of Charleville | 11 January 1893 | |
| Robert Bourke, 5th Earl of Mayo | 22 June 1852 | Randall Edward Plunkett, 15th Baron Dunsany | 12 August 1867 | |
| Richard Bantry, 2nd Earl of Bantry | 1 July 1854 | Hayes St Leger, 3rd Viscount Doneraile | 16 July 1868 | |
| Edward Ward, 4th Viscount Bangor | 9 January 1855 | Henry Sadlier Prittie, 2nd Baron Dunalley | 14 September 1881 | |
| Hayes St Leger 4th Viscount Doneraile | 2 May 1855 | Robert Edward King, 1st Viscount Lorton | 26 August 1887 | |
| Mark Trevor, 3rd Viscount Dungannon | 11 September 1855 | John Bruce Richard O'Neill, 3rd Viscount O'Neill | 11 August 1862 | |
| Henry John Reuben Dawson-Damer, 3rd Earl of Portarlington | 24 October 1855 | James Du Pre Alexander, 3rd Earl of Caledon | 1 March 1889 | |
| James Hewitt, 4th Viscount Lifford | 23 January 1856 | John Vesey, 2nd Viscount de Vesci | 20 November 1887 | |
| Thomas Vesey, 3rd Viscount de Vesci | 10 January 1857 | Cornwallis Maude, 3rd Viscount Hawarden | 23 December 1875 | |
| Somerset Lowry-Corry, 4th Earl Belmore | 13 January 1857 | James Bernard, 2nd Earl of Bandon | 6 April 1913 | |
| Francis Bernard, 3rd Earl of Bandon | 21 August 1858 | Richard Butler, 2nd Earl of Glengall | 17 February 1877 | |
| Cornwallis Maude, 1st Earl de Montalt | 2 December 1862 | Mark Trevor, 3rd Viscount Dungannon | 9 January 1905 | |
| Lucius O’Brien, 13th Baron Inchiquin | 20 October 1863 | Ulysses Bagenal Burgh, 2nd Baron Downes | 22 March 1872 | |
| Edward Plunkett, 16th Baron Dunsany | 8 March 1864 | Francis William Caulfeild, 2nd Earl of Charlemont | 22 February 1889 | |
| John Prendergast Vereker, 3rd Viscount Gort | 13 June 1865 | John Otway O'Connor Cuffe, 3rd Earl of Desart | 20 October 1865 | |
| Mervyn Wingfield, 7th Viscount Powerscourt | 26 December 1865 | John Prendergast Vereker, 3rd Viscount Gort | 5 June 1904 | |
| George Frederick Upton, 3rd Viscount Templetown | 14 September 1866 | George John Danvers Butler, 5th Earl of Lanesborough | 4 January 1890 | |
| William Richard Annesley, 4th Earl of Annesley | 15 October 1867 | Robert Bourke, 5th Earl of Mayo | 10 August 1874 | |
| Theobald Fitzwalter Butler, 14th Baron Dunboyne | 11 January 1868 | William Parsons, 3rd Earl of Rosse | 22 March 1881 | |
| Charles Allanson-Winn, 3rd Baron Headley | 28 September 1868 | Richard Bantry, 2nd Earl of Bantry | 30 July 1877 | |
| Lawrence Parsons, 4th Earl of Rosse | 22 December 1868 | Henry Maxwell, 7th Baron Farnham | 29 August 1908 | |
| William Henry Hare Hedges-White, 3rd Earl of Bantry | 6 July 1869 | William Howard, 4th Earl Wicklow | 15 January 1884 | |
| Geoffrey Dominick Augustus Frederick Guthrie-Browne, 2nd Baron Oranmore and Browne | 6 September 1869 | Richard Handcock, 3rd Baron Castlemaine | 15 November 1900 | |
| John Vansittart Danvers Butler, 6th Earl of Lanesborough | 5 April 1870 | Edward Crofton, 2nd Baron Crofton | 12 September 1905 | |
| Dayrolles Blakeney Eveleigh-de-Moleyns, 4th Baron Ventry | 10 July 1871 | George Thomas John Nugent, 1st Marquess of Westmeath | 8 February 1914 | |
| Charles Francis Arnold Howard, 5th Earl of Wicklow | 19 June 1872 | Lucius O’Brien, 13th Baron Inchiquin | 20 June 1881 | |
| Edward Henry Churchill Crofton, 3rd Baron Crofton | 11 February 1873 | Eyre Massey, 3rd Baron Clarina | 22 September 1912 | |
| Edward Donough O’Brien, 14th Baron Inchiquin | 5 April 1873 | John Cavendish Browne, 3rd Baron Kilmaine | 9 April 1900 | |
| Richard Handcock, 4th Baron Castlemaine | 9 May 1874 | Cadwallader Davis Blayney, 12th Baron Blayney | 26 April 1892 | |
| John Henry Reginald Scott, 4th Earl of Clonmell | 10 November 1874 | William Richard Annesley, 4th Earl of Annesley | 22 June 1891 | |
| John Thomas William Massy, 6th Baron Massy | 14 March 1876 | Thomas Vesey, 3rd Viscount de Vesci | 28 November 1915 | |
| Hugh Annesley, 5th Earl of Annesley | 28 April 1877 | Francis Bernard, 3rd Earl of Bandon | 15 December 1908 | |
| James Alexander, 4th Earl of Caledon | 30 October 1877 | Charles Allanson-Winn, 3rd Baron Headley | 27 April 1898 | |
| James Francis Bernard, 4th Earl of Bandon | 6 June 1881 | Theobald Fitzwalter Butler, 14th Baron Dunboyne | 18 May 1924 | |
| Edward Nugent Leeson, 6th Earl of Milltown | 23 August 1881 | Charles Francis Arnold Howard, 5th Earl of Wicklow | 30 May 1890 | |
| Francis Charles Needham, 3rd Earl of Kilmorey | 31 December 1881 | Edward Ward, 4th Viscount Bangor | 28 July 1915 | |
| Charles Mark Allanson-Winn, 4th Baron Headley | 20 December 1883 | Stephen Moore, 4th Earl Mount Cashell | 13 January 1913 | |
| Hercules Edward Rowley, 4th Baron Langford | 14 March 1884 | William Henry Hare Hedges-White, 3rd Earl of Bantry | 29 October 1919 | |
| Henry Ward, 5th Viscount Bangor | 12 January 1886 | John Crichton, 3rd Earl of Erne | 23 February 1911 | |
| Henry Ernest Newcomen King-Tenison, 8th Earl of Kingston | 24 October 1887 | Hayes St Leger 4th Viscount Doneraile | 13 January 1896 | |
| Cecil Ralph Howard, 6th Earl of Wicklow | 23 January 1888 | James Hewitt, 4th Viscount Lifford | 24 July 1891 | |
| Eyre Challoner Henry Massey, 4th Baron Clarina | 31 December 1888 | George Charles Bingham, 3rd Earl of Lucan | 16 December 1897 | |
| Thomas Kane McClintock-Bunbury, 2nd Baron Rathdonnell | 8 April 1889 | Edward Plunkett, 16th Baron Dunsany | 22 May 1929 | |
| Charles George Bingham, 4th Earl of Lucan | 19 April 1889 | Henry John Reuben Dawson-Damer, 3rd Earl of Portarlington | 5 June 1914 | |
| Francis William Browne, 4th Baron Kilmaine | 21 February 1890 | George Frederick Upton, 3rd Viscount Templetown | 9 November 1907 | |
| Dermot Robert Wyndham Bourke, 7th Earl of Mayo | 14 July 1890 | Edward Nugent Leeson, 6th Earl of Milltown | 31 December 1927 | |
| William Charles Evans-Freke, 8th Baron Carbery | 3 August 1891 | John Henry Reginald Scott, 4th Earl of Clonmell | 7 November 1894 | |
| Henry O’Callaghan Prittie, 4th Baron Dunalley | 9 October 1891 | Cecil Ralph Howard, 6th Earl of Wicklow | 5 August 1927 | |
| Hamilton Matthew Tilson Fitzmaurice Deane-Morgan, 4th Baron Muskerry | 13 June 1892 | Richard Handcock, 4th Baron Castlemaine | 9 June 1929 | |
| John William Plunkett, 17th Baron Dunsany | 6 March 1893 | Denis St George Daly, 2nd Baron Dunsandle | 16 January 1899 | |
| Henry Edward Montagu Dorington Clotworthy Upton, 4th Viscount Templetown | 29 January 1894 | Robert Dillon, 3rd Baron Clonbrock | 30 September 1939 | |
| Luke Gerald Dillon, 4th Baron Clonbrock | 21 January 1895 | William Charles Evans-Freke, 8th Baron Carbery | 12 May 1917 | |
| George Lionel Henry Seymour Dawson-Damer, 5th Earl of Portarlington | 20 March 1896 | Henry Ernest Newcomen King-Tenison, 8th Earl of Kingston | 31 August 1900 | |
| Albert Edward Handcock, 5th Baron Castlemaine | 7 March 1898 | Eyre Challoner Henry Massey, 4th Baron Clarina | 6 July 1937 | |
| Somerset Henry Maxwell, 10th Baron Farnham | 22 July 1898 | James Alexander, 4th Earl of Caledon | 22 November 1900 | |
| Ponsonby William Moore, 9th Earl of Drogheda | 31 March 1899 | John William Plunkett, 17th Baron Dunsany | 28 October 1908 | |
| Reymond Hervey de Montmorency, 3rd Viscount Frankfort de Montmorency | 5 June 1900 | Edward Donough O’Brien, 14th Baron Inchiquin | 7 May 1902 | |
| Lucius William O’Brien, 15th Baron Inchiquin | 23 November 1900 | George Lionel Henry Seymour Dawson-Damer, 5th Earl of Portarlington | 9 December 1929 | |
| Robert St John Fitzwalter Butler, 16th Baron Dunboyne | 4 January 1901 | Geoffrey Dominick Augustus Frederick Guthrie-Browne, 2nd Baron Oranmore and Browne | 29 August 1913 | |
| Anthony Francis Nugent, 11th Earl of Westmeath | 4 February 1901 | Somerset Henry Maxwell, 10th Baron Farnham | 12 December 1933 | |
| Geoffrey Henry Browne, 3rd Baron Oranmore and Browne | 11 July 1902 | Reymond Hervey de Montmorency, 3rd Viscount Frankfort de Montmorency | 30 June 1927 | |
| Charles Bertram Bellew, 3rd Baron Bellew | 1 August 1904 | Mervyn Wingfield, 7th Viscount Powerscourt | 15 July 1911 | |
| Ivo Francis Walter Bligh, 8th Earl of Darnley | 10 March 1905 | Cornwallis Maude, 1st Earl de Montalt | 10 April 1927 | |
| Ralph Francis Howard, 7th Earl of Wicklow | 27 November 1905 | John Vansittart Danvers Butler, 6th Earl of Lanesborough | 11 October 1946 | |
| George Nathaniel Curzon, 1st Marquess Curzon | 21 January 1908 | Francis William Browne, 4th Baron Kilmaine | 20 March 1925 | |
| Frederic Oliver Trench, 3rd Baron Ashtown | 4 November 1908 | Lawrence Parsons, 4th Earl of Rosse | ( 20 March 1946) † | |
| Arthur Kenlis Maxwell, 11th Baron Farnham | 18 December 1908 | Ponsonby William Moore, 9th Earl of Drogheda | 5 February 1957 | |
| Yvo Richard Vesey, 5th Viscount de Vesci | 13 February 1909 | Hugh Annesley, 5th Earl of Annesley | 16 August 1958 | |
| John Edward Deane Browne, 5th Baron Kilmaine | 14 April 1911 | Henry Ward, 5th Viscount Bangor | 27 August 1946 | |
| William Edward Parsons, 5th Earl of Rosse | 9 October 1911 | Charles Bertram Bellew, 3rd Baron Bellew | 10 June 1918 | |
| John Graham Hope de la Poer Beresford, 5th Baron Decies | 18 November 1912 | Edward Henry Churchill Crofton, 3rd Baron Crofton | 31 January 1944 | |
| Maxwell Ward, 6th Viscount Bangor | 7 March 1913 | Charles Mark Allanson-Winn, 4th Baron Headley | 17 November 1950 | |
| Charles John Brinsley Butler, 7th Earl of Lanesborough | 2 June 1913 | Somerset Lowry-Corry, 4th Earl Belmore | 18 August 1929 | |
| Henry Charles Ponsonby Moore, 10th Earl of Drogheda | 21 November 1913 | Robert St John Fitzwalter Butler, 16th Baron Dunboyne | 22 November 1957 | |
| George Leopold Bryan Bellew-Bryan, 4th Baron Bellew | 20 April 1914 | Dayrolles Blakeney Eveleigh-de-Moleyns, 4th Baron Ventry | 15 June 1935 | |
| George Charles Bingham, 5th Earl of Lucan | 10 August 1914 | Charles George Bingham, 4th Earl of Lucan | 20 April 1949 | |
| Frederick Lambart, 10th Earl of Cavan | 24 September 1915 | Francis Charles Needham, 3rd Earl of Kilmorey | 28 August 1946 | |
| Arthur Edward Lowther Crofton, 4th Baron Crofton | 10 January 1916 | Frederic Oliver Trench, 3rd Baron Ashtown | 15 June 1942 | |
| Francis Charles Adelbert Henry Neeham, 4th Earl of Kilmorey | 14 February 1916 | John Thomas William Massy, 6th Baron Massy | 11 January 1961 | |
| Henry Edwyn King-Tenison, 9th Earl of Kingston | 13 July 1917 | Luke Gerald Dillon, 4th Baron Clonbrock | 11 January 1946 | |
| James Edward Caulfeild, 8th Viscount Charlemont | 19 August 1918 | William Edward Parsons, 5th Earl of Rosse | 30 August 1949 | |
| Robert Soame Jocelyn, 8th Earl of Roden | 22 December 1919 | Hercules Edward Rowley, 4th Baron Langford | 30 October 1956 |