Otto von Bismarck
He was Graf von Bismarck-Schönhausen (Count Bismarck-Schönhausen) in 1865. In 1871, he was Fürst von Bismarck (Prince Bismarck). In 1890, he became the Herzog von Lauenburg (Duke of Lauenburg). At first, he did not want to become a duke, but he accepted the title later.