From a geographical perspective, it was sometimes also considered part of Kulmerland, although it is east of the river Drwęca (Drewenz).
The land of Michałowo and Lubawa (Löbau) were part of Prussian territory in direct vicinity of the Kulmerland.
Conquered in the 11th century a territory named Masovia developed as borderland between the Prussians and Masovians, who at a time of the fragmentation of Poland had made themselves independent of the Polish rulers.
The rulers of Kujavia and Masovia had given lands to the monk and apostle of the Prussians, Christian of Oliva, He was declared first bishop of Prussia by the pope and he also bought additional territories.
A Prussian chieftain had given bishop Christian his land Löbau, by accepting Christianisation at Rome.