Fürstbistum Ermland
In Prussia, which was still mainly inhabited by heathen Old Prussians, the Prince-Bishopric of Warmia had been created in 1243 by the papal legate William of Modena, along with bishoprics of Culm, Pomesania, and Samland. These four dioceses came under the rule of the appointed Archbishop of Prussia. Several bishops at that time, including Anselm, were priests of the Teutonic Order which undertook the ongoing Prussian Crusade in the East.