The Treaty of Thorn was signed on January 1, 1466, between the Kingdom of Poland and the Teutonic Order. This agreement marked the end of the Thirteen Years' War, which had begun in 1454. The treaty resulted in significant territorial changes, with the Teutonic Order ceding parts of its territory to Poland, including the region of Prussia. As a result of the treaty, the Teutonic Order became a vassal of the Polish crown, leading to the establishment of the Duchy of Prussia. This treaty significantly altered the balance of power in the region and laid the groundwork for future conflicts and political developments in Central Europe.