Wilhelm_Karl_Prinz_von_Preussen--William,_German_Crown_Prince

Wilhelm Karl Adalbert Erich Detloff Prinz von Preussen (30 January 1922, in Potsdam – 9 April 2007, in Holzminden) was the third son of Prince Oskar of Prussia, and the last surviving grandson of Wilhelm II, the last German Emperor. He was the thirty-sixth Master of Knights (Herrenmeister) of the Protestant (and largely German) Order of Saint John (Bailiwick of Brandenburg), also known as Der Johanniterorden, as his father's successor and his son's predecessor.