William George Spencer Cavendish, 6th Duke of Devonshire (1790 - 1858), was known as the Bachelor Duke. In 1811, at the age of 21, he inherited eight stately homes and 200,000 acres (809 km²) of land. ...
The Dukes of Devonshire are members of the aristocratic Cavendish family in the United Kingdom.
The Duke of Devonshire's eldest son may use the courtesy title Marquess of Hartington, whilst the eldest son of the eldest son may use the title Earl of Burlington; any sons he may have would use the title Baron Cavendish.
The Marquessate of Hartington, the Earldom of Devonshire and the Barony of Cavendish of Hardwick are in the peerage of England, while the Earldom of Burlington and the Barony of Cavendish of Keighley are in the United Kingdom peerage.