Prince Wilhelm-Karl of Prussia

Wilhelm Karl Adalbert Erich Detloff Prince of Prussia (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 ancient and beneficent Protestant (and largely German) Order of Saint John (Bailiwick of Brandenburg), also known as Der Johanniterorden.