On April 10, 1525, two days after signing of the Treaty of Kraków which officially ended the Polish–Teutonic War (1519–21), in the main square of the Polish capital Kraków, Albert resigned his position as Grand Master of the Teutonic Knights and received the title "Duke of Prussia" from King Zygmunt I the Old of Poland.
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In the aftermath of the armistice ending the Polish-Teutonic War Albert, Grand Master of the Teutonic Knights and a member of the House of Hohenzollern, visited Martin Luther at Wittenberg and soon thereafter became sympathetic to Protestantism.
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