In accordance with the new Treaty of Kraków, the Order was abruptly secularized and turned de facto into a puppet state of Poland which lasted until the Treaty of Bromberg in 1655. Sigismund's nephew Albert, Duke of Prussia, converted to Lutheranism under the persuasion of Martin Luther, and paid a feudal homage to Sigismund. In return he was granted the domains of the Order as the First Duke of Prussia. This became known in Polish and Lithuanian history as the "Prussian Homage", which was often featured in arts. The Prussian Landtag and parliament assembled in Königsberg, where envoys embraced both the new Duke and the Protestant Reformation. Thereupon, the Teutonic Order lost its importance as a military order in Prussia and retreated to the Holy Roman Empire where it became secluded.