William Cavendish, Marquess of Hartington
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|William John Robert Cavendish|
|Born||10 December 1917|
|Died||9 September 1944
Heppen, occupied Belgium
|Spouse(s)||Kathleen Agnes Kennedy
(m. May – September 1944; his death)
|Relations||Andrew Robert Buxton Cavendish (brother)|
|Parents||Edward Cavendish, 10th Duke of Devonshire
|Unit||Coldstream Guards, Guards Armoured Division|
|Battles/wars||World War II|
William John Robert "Billy" Cavendish, Marquess of Hartington (10 December 1917 – 9 September 1944), was an English politician. He was the eldest son of Edward William Spencer Cavendish, 10th Duke of Devonshire and his wife, Mary Alice Gascoyne-Cecil. He was the husband of Kathleen Agnes "Kick" Kennedy, sister of future U.S. President John Fitzgerald "Jack" Kennedy.
Cavendish was a member of the Conservative Party. He was the official candidate of the Wartime Coalition in the 18 February 1944 by-election for Derbyshire West. Independent Charles Frederick White, Jr. had resigned from the Labour Party to challenge and defeat him in contravention of the Wartime Coalition's truce on partisan campaigning.
Cavendish married socialite Kathleen Agnes "Kick" Kennedy on 6 May 1944 at the Register Office in Chelsea Town Hall on King's Road in London, England. In addition to President John F. Kennedy, she was a sister of Senators Robert F. Kennedy and Ted Kennedy. Her mother Rose highly 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.
Four months later, on 9 September 1944, Billy was killed in action by a sniper in Belgium while serving during World War II as a major in the Coldstream Guards. His company was trying to capture the town of Heppen, which was being held by troops of the German SS.
In the weeks before he died, Cavendish's battalion, the 5th, serving in the Guards Armoured Division, had engaged in heavy fighting in Northern France. In early September, they crossed the Somme and pushed east towards Brussels, where his unit was one of the first to liberate the city.
Of the townsfolk and villagers who turned out and cheered the Allies, and in some cases decorated their tanks, William wrote to his wife of feeling "so unworthy of it all living as I have in reasonable safety and comfort during these years..... I have a permanent lump in my throat and long for you to be here as it is an experience which few can have and which I would love to share with you."
- Spencer, Charles (January 2010). "Enemies of the Estate". Vanity Fair. Retrieved 2013-05-20.
- "LIFE", 13 Mar 1944, pp 28-29.
- "The Cavendishes & the Kennedys". Time. 15 May 1944. Retrieved 10 August 2008.
- Bailey, C. (2007). Black Diamonds: The Rise and Fall of an English Dynasty, p. 375. London: Penguin. ISBN 978-0-670-91542-2.
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