The third creation, in the Peerage of Great Britain, was for Prince William Augustus, the third son of King George II. Other titles granted to Prince William were Marquess of Berkhampstead, Earl of Kennington, Viscount Trematon and Baron Alderney. Since the Prince died unmarried and without children, his titles became extinct at his death.
The title was created again in the Peerage of Great Britain, but the form being changed to "Cumberland and Strathearn". The dukedom and also the Earldom of Dublin in the Peerage of Ireland were bestowed on Prince Henry Frederick, the third son of Frederick Lewis, Prince of Wales, and grandson of King George II. Since Prince Henry died without legitimate children, the title became extinct again.
The last creation (the form being "Duke of Cumberland and Teviotdale") was for Ernest Augustus (later King of Hanover), fifth son of King George III of the United Kingdom. The title was suspended for the third Duke's pro-German activities during World War I. Under the 1917 Titles Deprivation Act, the lineal male heirs of the 3rd Duke of Cumberland and Teviotdale have the right to petition the British Crown for the restoration of his peerages. To date, none has done so. The present heir is Prince Ernst August of Hanover (born 26 February 1954), great grandson of the 3rd Duke and current head of the House of Hanover. He is the senior male-line descendant of George III of the United Kingdom.
ERNEST AUGUSTUS (1771-1851), king of Hanover and duke of Cumberland, fifth son of the English king George III., was born at Kew on the 5th of June 1771.
In the same year he was created duke of Cumberland and Teviotdale and granted an allowance of £i 2,000 a year, after which he held several lucrative military positions in England, and began to attend the sittings of the House of Lords and to take part in political life.
Recovering from his wounds, Cumberland again proceeded to the seat of war; and having been made a British field-marshal, was in command of the Hanoverian army during the campaigns of 1813 and 1814, being present, although not in action, at the battle of Leipzig.
CUMBERLAND The earldom of Cumberland was held by the family of Clifford from 1525 to 1643, when it became extinct by the death of Henry, the 5th earl.
As this duke was never married the title lapsed on his death in 1765, but was revived in the following year in favour of Henry Frederick (1745-1790), son of Frederick, prince of Wales, and brother of George III.
Having again become extinct on Henry Frederick's death, the title of duke of Cumberland was created for the fifth time in favour of Ernest Augustus, who was made duke of Cumberland and Teviotdale in 1799.