Braunschweig-Lüneburg, Ernst August, 1913-1918, 3 Mark 1915
Ernst August von Hannover Duke of Brunswick, Duke of Brunswick and Lüneburg, Prince of Hanover. He was the last reigning Duke of the Duchy of Brunswick and the last reigning monarch of the House of Hanover from 1 November 1913 until his abdication on 8 November 1918.
On 24 May 1913 Ernst August married Princess Viktoria Luise, the only daughter of the Prussian King and German Emperor Wilhelm II. The marriage healed the decades-old rift between the houses of Hohenzollern and Hanover. It was also the last major meeting of European sovereigns (many of whom were descended from Queen Victoria or King Christian IX) before the outbreak of the World War.