Peace of Westphalia, thwarting Brandenburg-Prussia's ambitions for inheritance of the whole former Duchy of Pomerania. This led to tensions between Brandenburg-Prussia and Sweden in Pomerania until Sweden lost her Western Pomeranian possessions in 1720 (Stettin government region) and 1815 (Stralsund government region). Landkreis Lauenburg-Bütow comprised the Lauenburg and Bütow Land, a Pomerelian borderland with a somewhat different history than the rest of Pomerania. It was in 1846 dissolved into smaller administrative units. In contrast to ethnic German Pomerania, this area also had a Kashubian population. Landkreis Fürstenthum comprised the earlier secular possessions of the Roman Catholic Diocese of Kammin prince-bishops, and was ruled by administrators from the Pomeranian ducal house since the aftermath of the Reformation until 1650. Until 1872, the area kept its territorial integrity, before it was dissolved into smaller administrative units. Subdivisions urban districts (): Stolp: population 27,293 (1900); 50,377 (1939) Köslin: split off Landkreis Köslin in 1923, population 33,479 (1939) Kolberg: split off Landkreis Kolberg-Körlin in 1920, population 36,617 (1939) rural districts (): Landkreis Belgard (Persante): population 47,097 (1900); 79,183 (1939) Landkreis Dramburg: population 35,863 (1900); Landkreis Fürstenthum (1816–1872), 1872 divided into Landkreis Bublitz: population 20,916 (1900); in 1932 merged into Landkreis Köslin Landkreis Kolberg-Körlin: population 57,871 (1900); 38,785 (1939) Landkreis Köslin: population 48,678 (1900); 80,287 (1939) Landkreis Greifenberg i. Pom.: until 1939 administered by Regierungsbezirk Stettin, population 47,891 (1939) Landkreis Lauenburg-Bütow (the Lauenburg and Bütow Land), 1846 divided into: Landkreis Bütow: population 26,021 (1900); 28,018 (1939) Landkreis Lauenburg i. Pom.: population 45,986 (1900); 63,985 (1939) Landkreis Neustettin: population 76,101 (1900); since 1938 administered by Regierungsbezirk Grenzmark Posen-Westpreußen Regenwalde: 49,668 (1939), until 1938 administered by Regierungsbezirk Stettin Landkreis Rummelsburg i. Pom.: population 33,785 (1900); 40,692 (1939) Landkreis Schivelbein: population 19,656 (1900); in 1932 merged into Landkreis Belgard (Persante) Landkreis Schlawe i. Pom.: population 73,206 (1900); 78,363 (1939) Landkreis Stolp: population 75,310 (1900); 83,009 (1939) Stettin government region (Western Pomerania) The Stettin government region () since 1932 comprised the region of Western Pomerania (, "Hither Pomerania"), the former Swedish Pomerania. From 1815, the Stettin government region comprised only the southern parts of Western Pomerania (Old Western Pomerania, i.e. south of the Peene river). This part had been Swedish only until 1720, thereafter it was merged into the Prussian Province of Pomerania (1653-1815). New Western Pomerania (north of the river) was administered as Regierungsbezirk Stralsund until it was merged into Regierungsbezirk Stettin in 1932. Stettin, the former ducal