Example image of eyePlorer eyePlorer map for 'Duchy of Prussia': Duchy Prussia (region) Lutheranism Masurians Protestantism Prussian Lithuanians Royal Prussia State of the Teutonic Order Prutenic Tables Albert, Duke of Prussia Grand Masters of the Teutonic Knights Protestant Reformation Teutonic Knights Crown of the Kingdom of Poland Królewiec Königsberg Brandenburg-Prussia House of Hohenzollern Margraviate of Brandenburg Personal union Prince-elector Frederick William I, Elector of Brandenburg Treaty of Oliva Treaty of Wehlau Kingdom of Prussia Cadet branch Catholic Church Bishopric of Samland Kingdom of Poland (1385–1569) Polish–Teutonic War (1519–1521) Martin Luther Nuremberg Wittenberg 1525 April 10 Prussian Homage Sigismund I the Old Peace of Augsburg Coat of arms of Prussia Charles V, Holy Roman Emperor Pope Clement VII Klaipėda Komtur Holy Roman Empire Walter von Cronberg 1526 Frederick I of Denmark March 1 Scandinavia Franconia