Count of Mértola

The title Count of Mértola (Conde de Mértola) was granted to General Schomberg by Afonso VI of Portugal, in 1663, as a reward for Schomberg's services with the Portuguese army. The title has passed through female lines various times and is usually held concurrently by the Barons Darcy de Knayth and Conyers.

Counts of Mértola (1663)

• 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, 11th Countess of Mértola (b. 1920)

Heir Presumptive: Anthea Lycett (b. 1954) (Lady Diana's elder daughter, adopted by Diana's sister Lady Wendy Lycett in 1959)