William John Robert Cavendish, Marquess of Hartington, was a British politician and British Army officer. He was the elder son of Edward Cavendish, 10th Duke of Devonshire, and therefore the heir to the dukedom. He was killed in action in the Second World War during fighting in the Low Countries in September 1944 whilst leading a company of the Coldstream Guards.
- Occupation
- military personnel
- Position held
- heir apparent
- Citizenship
- United Kingdom, United Kingdom of Great Britain and Ireland
- Born
- December 10, 1917