 The treaty was concluded in 1525 in Kraków; the remaining state of the Teutonic Knights (East Prussia centered on Königsberg) was converted into the Protestant (Lutheran) Duchy of Prussia under the King of Poland and the homage act of the new Prussian duke in Kraków followed.In reality the House of Hohenzollern, of which Albrecht was a member, the ruling family of the Margraviate of Brandenburg, had been actively expanding its territorial influence; for example already in the 16th century in Farther Pomerania and Silesia.Motivated by a current political expediency, Sigismund Augustus in 1563 allowed the Brandenburg elector branch of the Hohenzollerns, excluded under the 1525 agreement, to inherit the Prussian fief rule.