Representatives from the Prussian Confederation, an alliance of city leaders, nobility, and clergy from throughout Prussia, pledge their allegiance to Polish king Casimir IV in exchange for his assistance in a war of independence against the Teutonic Knights.
Prussian leaders had long been seeking greater rights and greater influence over their own political futures, but the Teutonic Knights have been adamant about preserving their medieval, monastic system of rule. King Casimir IV of Poland agrees to go to war on their behalf in exchange for incorporating their Prussian lands into the Kingdom of Poland.
They all expect that the war against the Teutonic Knights will go quickly, but it will last until 1466 and be called the Thirteen Years' War. In the end the Teutonic Knights lose and Prussia becomes part of Poland.