called the War of the Priests. Participating towns Towns which founded the Prussian Confederation on 14 March 1440: Towns which joined the Prussian Confederation in 1440: Further towns joined in the following years, including Pasym, Nidzica, Działdowo, Dąbrówno, Olsztynek, Prabuty. References Thirteen Years' War (1454–1466) Politics of Prussia 1440 establishments in Europe Former confederations Secessionist organizations in Europe