Pomesania
Pomesania was a bishopric in Teutonic Prussia, with its chapter at the fortified cathedral of Marienwerder. In 1337 its bishop was Berthold; the canons belonged to the Teutonic Order, which administered the bishop's temporal lands.
In 1454 the bishop and chapter joined the Prussian Confederation and submitted to Casimir IV of Poland; the Second Peace of Thorn confirmed the arrangement in 1466. The Reformation brought Lutheran bishops from 1523, and the diocese was secularized into Ducal Prussia in 1587.