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 Louis, Duke of Württemberg William Louis, Duke of Württemberg William Louis of Württemberg (7 January 1647 – 23 June 1677) was the ruler of the senior Duchy of Württemberg from 1674 until his death in 1677. William Louis was born in Stuttgart, the ninth child of Eberhard III, Duke of Württemberg, and his first wife Anna Katharina of Kyrburg. At the age of 30, the Duke died unexpectedly of a heart attack at the stop-over in Schloß Hirsau. His widow Magdalena Sibylla became regent of Württemberg between 1677 and 1693, until her son reached adulthood. He married on 6 November 1673 in Darmstadt with