Treaty of Kiel
A part of the region south of the Peene river (Old Western Pomerania or "Altvorpommern") came under Prussian sovereignty after the Stockholm peace treaty in 1720. Under the Treaty of Kiel, the remnants of Swedish Pomerania (New Western Pomerania or "Neuvorpommern") were briefly transferred to Denmark in 1814, but the 1815 Congress of Vienna ceded the territory to Prussia.