Counts of Mértola (1663)
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- Frederick Schomberg, 1st Duke of Schomberg, 1st Count of Mértola (1615-1690)
- Meinhardt Schomberg, 3rd Duke of Schomberg, 2nd Count of Mértola (1641-1719)
- Frederica Darcy, Countess FitzWalter, 3rd Countess of Mértola (1688-1751)
- Robert Darcy, 4th Earl of Holderness, 4th Count of Mértola (1718-1778)
- Amelia Osborne, Marchioness of Carmarthen, 5th Countess of Mértola (1754-1784)
- George Osborne, 6th Duke of Leeds, 6th Count of Mértola (1775-1838)
- Francis D'Arcy-Osborne, 7th Duke of Leeds, 7th Count of Mértola (1798-1859)
- Sackville Lane-Fox, 12th Baron Conyers, 8th Count of Mértola (1827-1888)
- Marcia Pelham, Countess Yarborough, 9th Countess of Mértola (1863-1926)
- Sackville Pelham, 5th Earl of Yarborough, 10th Count of Mértola (1888-1948)
- Lady Diana Miller, 15th Baroness Conyers and 9th Baroness Fauconberg, 11th Countess of Mértola (1920-2013)[1]
- Hon. Anthea Lycett, 12th Countess of Mértola (born 1954)
Diana Miller, 11th Countess of Mértola (1920–2013)
- Hon. Anthea Lycett, 12th Countess of Mértola (born 1954, adopted by her maternal aunt Lady Wendy Lycett [née Pelham] and husband Major Michael Lycett)
- (1) Hon. Beatrix Miller (born 1955)
- (2) Guy Armstrong (born 1996)[2]
- (3) Matthew Armstrong (born 1998)