The state was formed in 1160, in the partition of the Duchy of Pomerania, with duke Bogusław I, as its first ruler.[1] In 1264, Barnim I, Duke of Stettin, had unified duchies of Pomerania-Stettin and Pomerania-Demmin, re-establishing the Duchy of Pomerania.[2] The state was again formed in 1295, in the partition of the Duchy of Pomerania, with Otto I as its ruler.[3][4] In 1478, the state was incorporated into the re-unified Duchy of Pomerania, under the rule of duke Bogislaw X.[5] Pomerania-Stettin was again established in 21 October 1532, with the partition of Duchy of Pomerania, with Barnim XI as its ruler.[6][7] The state existed until 1625, when, under the rule of Bogislaw XIV, it was incorporated into the unified Duchy of Pomerania.[8]