William Cavendish, Marquess of Hartington, and Kathleen “Kick” Kennedy at their 1944 wedding, in London, flanked by his mother, the Duchess of Devonshire, and the bride’s brother Joseph Kennedy Jr.

William Cavendish, Marquess of Hartington, and Kathleen “Kick” Kennedy at their 1944 wedding, in London, flanked by his mother, the Duchess of Devonshire, and the bride’s brother Joseph Kennedy Jr.