thumb|upright=1.2|Representatives of the Prussian Confederation take on oath of allegiance to Poland during the act of incorporation of Prussia in Kraków, 1454, Polish Central Archives of Historical Records The Confederation was led by the citizens of Danzig, Elbing, and Thorn. The gentry from Chełmno Land and Pomerelia participated as well. After the monastic knights complained to the Emperor and Council of Basel, the Prussian parliament had to dissolve itself in 1449, but immediately resumed its clandestine activities. In turn, in February 1454, the Confederation sent a delegation, under Jan Bażyński, to King Casimir IV Jagiellon of Poland, to ask him for support against the Teutonic Order's rule and for incorporation of their homeland into the Kingdom of Poland. In this treaty, Prussian delegates declared the Polish king the only true sovereign of their lands, justified by the historical fact that the king of Poland had earlier ruled them. After lengthy negotiation, on 6 March 1454, the Royal Chancellery issued the Incorporation Act by which king Kazimierz Jagiellończyk accepted inhabitants of the Prussian lands as subjects, incorporated Prussia to the Polish kingdom and granted them a large autonomy. The Prussian estates received confirmation of their rights and privileges, were exempted from paying the '', received the ius indigenatus, the right to decide on Prussian affairs at their own estate assemblies and a guarantee of the freedom of trade. Thorn, Elbing, Königsberg and Danzig (Danzig law) were to retain the right to mint coins during the war, although with the image of the Polish king.
thumb|upright=12|Representatives of the Prussian Confederation take on oath of allegiance to Poland during the act of incorporation of Prussia in Kraków 1454 Polish Central Archives of Historical Records The Confederation was led by the citizens of Danzig Elbing and Thorn The gentry from Chełmno Land and Pomerelia participated as well After the monastic knights complained to the Emperor and Council of Basel the Prussian parliament had to dissolve itself in 1449 but immediately resumed its clandestine activities In turn in February 1454 the Confederation sent a delegation under Jan Bażyński to King Casimir IV Jagiellon of Poland to ask him for support against the Teutonic Order's rule and for incorporation of their homeland into the Kingdom of Poland In this treaty Prussian delegates declared the Polish king the only true sovereign of their lands justified by the historical fact that the king of Poland had earlier ruled them After lengthy negotiation on 6 March 1454 the Royal Chancellery issued the Incorporation Act by which king Kazimierz Jagiellończyk accepted inhabitants of the Prussian lands as subjects incorporated Prussia to the Polish kingdom and granted them a large autonomy The Prussian estates received confirmation of their rights and privileges were exempted from paying the '' received the ius indigenatus the right to decide on Prussian affairs at their own estate assemblies and a guarantee of the freedom of trade Thorn Elbing Königsberg and Danzig (Danzig law) were to retain the right to mint coins during the war although with the image of the Polish king