Arthur Gerald Wellesley, Earl of Mornington, is the great-great-grandson of what  last German Emperor ("Kaiser") and King of Prussia?
Arthur Wellesley, Earl of Mornington Arthur Gerald Wellesley, Earl of Mornington (born 31 January 1978 at St Mary's Hospital in Paddington, London) is the son of Charles Wellesley, 9th Duke of Wellington. The Wellesleys are an aristocratic Anglo-Irish family. Through his mother, Antonia von Preussen, Duchess of Wellington, he is great-great-grandson of Kaiser Wilhelm II. As a descendant of Queen Victoria, he is eligible to succeed to the British throne.
Kaiser-Wilhelmsland Kaiser-Wilhelmsland was part of German New Guinea (German: "Deutsch-Neuguinea"), the South Pacific protectorate of the German Empire. Named in honour of Wilhelm II, who was the German Emperor and King of Prussia, it included the northern part of present-day Papua New Guinea. From 1884 until 1918, the territory was a protectorate of the German Empire. Kaiser-Wilhelmsland, New Pomerania, the Bismarck Archipelago, the northern Solomon Islands, the Caroline Islands, Palau, Nauru, the Mariana Islands, and the Marshall Islands comprised German New Guinea.