In 1155, Pomerania was divided in Pomerania, Pomerania-Stettin, and Pomerania-Demmin. While both Pomerania-Stetin and Pomerania-Demmin were ruled by sole dukes, Pomerania was ruled by the duke of -Stettin and the duke of -Demmin, together. In 1231 Emperor Frederick II granted the immediate liege lordship over Pomerania to the Margrave of Brandenburg, who enforced this claim by the Treaties of Kremmen (1236) and of Landin (1250). Thus Pomerania had become a fief of Brandenburg, thus an only mediate (indirect) subfief of the Empire, with Brandenburg itself being an immediate imperial fief. After Wartislaw III died heirless in 1264, Barnim I became sole duke of the whole duchy. After Barnim's death, the duchy was to be ruled by his sons Barnim II, Otto I and Bogislaw IV. The first years, Bogislaw, being the eldest, ruled in place of his too young brothers, too. In 1295, after Barnim's death, the duchy was partitioned into a northern duchy (Wolgast, ruled by Bogislaw), and a southern duchy (Stettin, ruled by Otto). In 1295, the Duchy of Pomerania was divided roughly by the Peene and Ihna rivers, with the areas north of these rivers ruled by Bogislaw IV became Pomerania-Wolgast, whereas [ - ]

In 1155, Pomerania was divided in Pomerania, Pomerania-Stettin, and Pomerania-Demmin. While both... [ + ]