Date inherited | Date of death or other loss of title | Title | Name | Other titles by marriage | Preceded in title by | Succeeded in title by |
1903 | 29 April 1929 | 16th Baroness Darcy de Knayth | Violet Herbert | Countess of Powis | Sackville Lane-Fox, father abeyant 1490-1903 | Mervyn Herbert, son |
28 August 1906 | 18 June 1917 | 14th Baroness Wentworth | Ada King-Milbanke | | Ralph King-Milbanke, father | Anne Blunt, aunt |
29 April 1907 | 4 May 1939 | 25th Baroness de Ros | Mary (FitzGerald-de Ros) Dawson | Countess of Dartrey | Dudley FitzGerald-de Ros, father | Una Ross, daughter abeyant 1939–1943 |
1908 | 28 August 1945 | 12th Lady Herries of Terregles | Gwendolen Fitzalan-Howard | Duchess of Norfolk | Marmaduke Constable-Maxwell, father | Bernard Fitzalan-Howard, son |
12 January 1912 | 26 February 1959 | 2nd Duchess of Fife | HH Princess Alexandra of Fife | HRH Princess Arthur of Connaught | Alexander Duff, father | James Carnegie, nephew |
25 March 1913 | 24 December 1936 | 2nd Viscountess Wolseley | Frances Garnet Wolseley | | Garnet Joseph Wolseley, father | Extinct |
14 November 1914 | 9 October 1944 | 2nd Countess Roberts | Aileen Roberts | | Frederick Roberts, father | Ada Lewin, sister |
12 November 1915 | 1969 | 12th Countess of Seafield | Nina Studley-Herbert | | James Ogilvie-Grant, father | Ian Ogilvie-Grant, son |
18 June 1917 | 15 December 1917 | 15th Baroness Wentworth | Anne Blunt | | Ada King-Milbanke, niece | Judith Blunt-Lytton, daughter |
15 December 1917 | 8 August 1957 | 16th Baroness Wentworth | Judith Blunt-Lytton | | Anne Blunt, mother | Noel Lytton, son |
3 July 1918 | 20 July 1958 | 2nd Viscountess Rhondda | Margaret Mackworth | | David Alfred Thomas, father | Extinct |
17 May 1920 | 24 February 1960 | 12th Countess of Loudoun | Edith Abney-Hastings | | Charles Clifton, uncle | Barbara Abney-Hastings, daughter |
7 March 1921 | 23rd Baroness Botreaux 20th Baroness Hastings | Charles Rawdon-Hastings, uncle abeyant 1920-1921 | Abeyant |
7th Baroness Stanley | Ferdinando Stanley abeyant 1594-1921 |
23 February 1921 | 12 December 1974 | 14th Baroness Strange | Elizabeth Philipps | Viscountess St Davids | Jestyn Philipps, son |
22nd Baroness Hungerford 21st Baroness de Moleyns | Charles Clifton, uncle abeyant 1920-1921 |
20 March 1925 | 9 February 1966 | 2nd Baroness Ravensdale | Irene Curzon, 2nd Baroness Ravensdale | Baroness Ravensdale of Kedleston created for life | George Curzon, father | Nicholas Mosley, nephew |
1935 | 1975 | 10th Countess of Dysart | Wenefryde Scott | | William Tollemache, uncle | Rosamund Greaves, daughter |
24 January 1941 | 16 May 1978 | 23rd Countess of Erroll | Diana Hay (Moncreiffe) | | Josslyn Hay, father | Merlin Hay, son |
March 1943 | 24 February 2008 | 18th Baroness Darcy de Knayth | Davina Ingrams | | Mervyn Herbert, father | Caspar Ingrams, son |
1943 | 9 October 1956 | 26th Baroness de Ros | Una Dawson Ross | | Mary Dawson, mother | Georgiana Maxwell, granddaughter abeyant 1956–1958 |
17 October 1944 | 30 September 2012 | 12th Lady Kinloss | Mary Freeman-Grenville | | Mary Morgan-Grenville, grandmother | Teresa Freeman-Grenville, daughter |
9 October 1944 | 1955 | 3rd Countess Roberts | Ada Lewin | | Aileen Roberts, sister | Extinct |
16 April 1956 | 17 April 1982 | 11th Lady Ruthven of Freeland | Bridget (Hore-Ruthven) (Howard) Monckton | Countess of Carlisle by first marriage Viscountess Monckton of Brenchley by second marriage | Walter Hore-Ruthven, father | Charles Howard, son |
1958 | 21 April 1983 | 27th Baroness de Ros | Georgiana Maxwell | | Una Ross, grandmother abeyant 1956-1958 | Peter Maxwell, son |
24 February 1960 | 2002 | 13th Countess of Loudoun | Barbara (Huddleston) Abney-Hastings | | Edith Abney-Hastings, mother | Michael Abney-Hastings, son |
1 February 1963 | | 24th Countess of Sutherland | Elizabeth Sutherland | | George Sutherland-Leveson-Gower, uncle | |
26 May 1966 | 21 September 1974 | 11th Countess of Kintore | Ethel Sydney Keith-Falconer | Viscountess Stonehaven | Arthur George Keith-Falconer, brother | James Ian Baird, son |
22 July 1969 | 1974 | 10th Baroness Wharton | Elisabeth Kemeys-Tynte | | John Kemeys-Tynte, brother | Myrtle Robertson, daughter abeyant 1974–1990 |
1970 | 25 December 2012 | 27th Baroness Dacre | Rachel Douglas-Home | | Thomas Brand, father abeyant 1965-1970 | James Douglas-Home, son |
22 April 1971 | 1990 | 2nd Baroness Portal of Hungerford | Rosemary Portal | | Charles Portal, father | Extinct |
31 January 1975 | 25 November 2014 | 14th Lady Herries of Terregles | Anne Cowdrey | Baroness Cowdrey of Tonbridge | Bernard Fitzalan-Howard, father | Mary Mumford, sister |
21 April 1975 | | 31st Countess of Mar | Margaret (Lane) of Mar | | James of Mar, father | |
1982 | 11 March 2005 | 16th Baroness Strange | Cherry Drummond of Megginch | | John Drummond, father | Adam Drummond, son |
29 March 1983 | | 28th Baroness Willoughby de Eresby | Nancy Jane Marie Heathcote-Drummond-Willoughby | | James Heathcote-Drummond-Willoughby, father | |
1975 | 2003 | 11th Countess of Dysart | Rosamund Greaves | | Wenefryde Scott, mother | Katherine Grant, sister |
27 August 1979 | 13 June 2017 | 2nd Countess Mountbatten of Burma | Patricia Knatchbull | Baroness Brabourne | Louis Mountbatten, father | Norton Knatchbull, son |
31 August 1979 | | 21st Lady Saltoun | Flora Fraser | | Alexander Fraser, father | |
1990 | 15 May 2000 | 11th Baroness Wharton | Myrtle Robertson | | Elisabeth Kemeys-Tynte, mother abeyant 1974–1990 | Myles Robertson, son |
May 1999 | | 11th Baroness Arlington | Jennifer Nelson Forwood | | John FitzRoy, uncle abeyant 1936-1999 | |