Duke of Normandy as the reign of William II (1035–87), the ruler of Normandy could style himself "prince and duke, count of Normandy" as if unsure what his title should be. The literal Latin equivalent of "Duke of Normandy", "dux Normanniae", was in use by 1066, but it did not supplant "dux Normannorum" until the Angevin period (1144–1204), at a time when Norman identity was fading. Richard I experimented with the title "marquis" ("marchio") as early as 966, when it was also used in a diploma of King Lothair. Richard II occasionally used it, but he seems to have preferred the title duke.
William Cavendish, 6th Duke of Devonshire dukedom passed to his cousin William Cavendish, 2nd Earl of Burlington. His junior title of Baron Clifford fell into abeyance between his sisters, Georgiana, Countess of Carlisle, and Harriet, Countess Granville. William Cavendish, 6th Duke of Devonshire William George Spencer Cavendish, 6th Duke of Devonshire, (21 May 1790 – 18 January 1858), styled Marquess of Hartington until 1811, was a British peer, courtier, nobleman, 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. The Cavendish banana is named after him. Born in Paris, France,