 Complete the following phrase:  In 1440, the city participated in the foundation of the Prussian Confederation which was an organisation opposed to the rule of the Teutonic Knights. The organisation in its complaint of 1453 mentioned repeated cases in which the Teutonic Knights imprisoned or murdered local patricians and mayors without a court verdict. Upon the request of the organisation King Casimir IV of Poland reincorporated the territory to the Kingdom of Poland in 1454. This led to the 