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In page Grudziądz:

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In 1440, the city co-founded the Prussian Confederation which opposed the Monastic State of the Teutonic Knights. At the beginning of the Thirteen Years' War (1454–66), the citizens forced the Teutonic Order to hand over the castle. The confederation asked the King of Poland, Casimir IV Jagiellon to join Poland. The King agreed and signed the act of incorporation in Kraków in March 1454.[1] Although there was support the Knights inside the city walls[citation needed] during the entirety of the war, both the city and the castle remained under Polish control. The 1466 peace treaty confirmed the re-incorporation of Grudziądz to Poland.[2]