Chełmno

The Bishopric of Chełmno was a Prussian diocese whose cathedral stood at Chełmża. In 1337 its bishops resided at Lubawa castle, and its cathedral canons belonged to the Teutonic Order.

The bishopric passed to Poland when Casimir IV reincorporated the region in 1454; the Second Peace of Thorn confirmed it in Royal Prussia in 1466. After the Order's state was secularized in 1525, it absorbed parts of the Pomesanian see. Prussia acquired it in the partitions of 1772 and 1793, and the seat moved to Pelplin in 1824.