The last duke of Demmin had died in 1264, and the 1236 territorial losses left Demmin at the westernmost edge of the Duchy of Pomerania.When Barmin I, for a short period sole ruler of the duchy, died in 1278, his oldest son Bogislaw IV took his father's seat.

When his half-brothers Otto I and Barnim II reached adulthood in 1294, the brothers rule in common until Barnim's death in 1295.

Bogislaw and Otto now agreed on a partition of the duchy, that will last until 1464: Bogislaw's share is the area where the towns are under Lübeck law, that is Vorpommern north of the Peene river (though including Anklam and Demmin on its southern bank) and Farther Pomerania north of the Ihna and Stepenitz rivers, both areas are connected by the islands of Usedom and Wollin.

Bogislaw makes Wolgast his residence, thus the partition becomes known as Pomerania-Wolgast.

Otto's share is the remainder between Peene and Ihna centered around Stettin, where the towns are under Magdeburg law.

This partition becomes known as Pomerania-Stettin.