William John Robert Cavendish, Marquess of Hartington
| William Cavendish, Marquess of Hartington | |
|---|---|
| Personal details | |
| Born |
William John Robert Cavendish 10 December 1917 London, England |
| Died | 9 September 1944 (aged 26) Heppen, occupied Belgium † |
| Political party | Conservative |
| Spouse(s) | Kathleen Agnes Kennedy (m. 1944; his death 1944) |
| Relations | Andrew Cavendish, 11th Duke of Devonshire (brother) |
| Parents |
Edward Cavendish, 10th Duke of Devonshire Mary Gascoyne-Cecil |
| Alma mater | Trinity College, Cambridge |
| Religion | Anglican |
| Military service | |
| Allegiance |
 United Kingdom
|
| Service/branch |
 British Army
|
| Rank | Major |
| Unit | Coldstream Guards, Guards Armoured Division |
| Battles/wars | |
Major William John Robert "Billy" Cavendish, Marquess of Hartington (10 December 1917 – 9 September 1944) was an English politician and soldier. He was the elder son of Edward Cavendish, 10th Duke of Devonshire, and his wife, Lady Mary Gascoyne-Cecil. He was the husband of Kathleen Kennedy, sister of the future U.S. President John F. Kennedy.
He was educated at Eton and Trinity College, Cambridge.
Hartington was a member of the Conservative Party. He was selected as the official candidate of the Wartime Coalition for the West Derbyshire by-election on 18 February 1944, in the constituency local to Chatsworth. He was faced by Charles Frederick White, Jr., who resigned from the Labour Party to run as an Independent candidate, evading the Wartime Coalition's ban on partisan campaigning. West Derbyshire had been held by Conservatives since 1923 (Hartington's father and then his uncle by marriage), but in a contentious campaign, White solidly defeated Hartington.
Hartington married socialite Kathleen Kennedy on 6 May 1944 at the Register Office in Chelsea Town Hall on King's Road in London, England. She was the daughter of former U.S. Ambassador to the United Kingdom Joseph Kennedy, and the sister of John, Robert and Ted Kennedy. The Duke of Devonshire and the bride's eldest brother Joseph P. Kennedy Jr., then a lieutenant in the United States Navy, signed the marriage register, and the Duke of Rutland served as best man. Her mother Rose disapproved of the union – the Kennedy family were Roman Catholic and the Dukes of Devonshire were Anglican, and neither would be married in the other's faith.
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