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.
Adolf William, Duke of Saxe-Eisenach Adolf married Marie Elisabeth of Brunswick-Wolfenbüttel. They had five children: Adolf lost all his sons shortly after birth, and his widow was pregnant with their fifth child at the time of his death. Eight days later, a son was born, called Wilhelm August, who inherited the estates of his father (under the regency of his uncle Johann Georg), until his death at only two years of age, whereupon Johann Georg inherited the estates. Adolf William, Duke of Saxe-Eisenach Adolf Wilhelm, Duke of Saxe-Eisenach (Weimar, 15 May 1632 – Eisenach, 21 November 1668), was a duke of Saxe-Eisenach. He was the