Elizabeth, 19th Countess of Sutherland then married George Granville Leveson-Gower in 1785; he inherited the title of Marquess of Stafford from his father in 1803. The Marquess held vast lands and wealth, having inherited from his father, the first Marquess of Stafford, from his maternal uncle, the second Duke of Bridgewater, and also holding much property associated with the Earldom of Sutherland, which belonged to his wife. He was made Duke Of Sutherland in 1833.
The Duke's son, also named George, inherited the Earldom of Sutherland from his mother and the Dukedom of Sutherland from his father. The two titles continued united until the death of the fifth Duke in 1963. The Earldom passed to his niece Elizabeth, while the Dukedom had to pass to a male heir.
The subsidiary title associated with the Earldom is ''Lord Strathnaver'' (created 1230), which is used as a Courtesy Title by the Earl's or Countess' eldest son and heir.
