The title of Duke of Cumberland had been created three times in the Peerages of England and Great Britain.
The title of Duke of Cumberland and Strathearn was created on 22 October 1766 in the Peerage of Great Britain. This double dukedom and the Earldom of Dublin in the Peerage of Ireland were bestowed on Prince Henry, the third son of Frederick, Prince of Wales, and grandson of King George II. Since Prince Henry died without legitimate children, the title became extinct.
Prince William Augustus (1721–1765) Duke of Cumberland, Marquess of Berkhamsted, Earl of Kennington, Viscount Trematon, Baron Alderney
Dukedom of Cumberland (3rd creation), Marquessate of Berkhamsted, Earldom of Kennington, Viscountcy Trematon (1st creation), and Barony Alderney extinct, 1765
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