William Cavendish, Marquess of Hartington

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William John Robert Cavendish, Marquess of Hartington (December 10, 1917September 10, 1944) was the eldest son of Edward Cavendish, 10th Duke of Devonshire and the husband of Kathleen Kennedy, sister of American President John F. Kennedy.

Hartington married Kathleen Kennedy on 6 May 1944 in London. Four months later he was killed in action by a sniper in Belgium while serving as a major in the Coldstream Guards. His place in the line of succession was taken by his younger brother Lord Andrew Cavendish, later 11th Duke of Devonshire.