The Duke of Devonshire by Sir Thomas Lawrence, 1811 - William George Spencer Cavendish, 6th Duke of Devonshire KG, PC (1790 – 1858), styled Marquess of Hartington until 1811, was a British peer, courtier and Whig politician. Known as the "Bachelor Duke", he was Lord Chamberlain of the Household between 1827 and 1828 and again between 1830 and 1834.

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