In the 12th century, the Duchy of Pomerania (western part), as a vassal state of Poland, became Christian under saint Otto of Bamberg (the Apostle of the Pomeranians); at the same time Pomerelia (eastern part) became a part of diocese of Włocławek within Poland. Since the late 12th-early 13th century, the Griffin Duchy of Pomerania stayed with the Holy Roman Empire and the Principality of Rugia with Denmark, while Pomerelia, under the ruling of Samborides, was a part of Poland.Jan M Piskorski, Pommern im Wandel der Zeiten, 1999, pp.35ff, Gerhard Krause, Horst Robert Balz, Gerhard Müller, Theologische Realenzyklopädie, De Gruyter, 1997, pp.40ff, Werner Buchholz, Pommern, Siedler, 1999, p.34ff,87,103, Jan M. Piskorski, Pommern im Wandel der Zeiten, 1999, p.43, Pomerania, during its alliance in the Holy Roman Empire, shared borders with West Slavic state Oldenburg, as well as Poland and the expanding Margraviate of Brandenburg. In the early 14th century the Teutonic Knights invaded and annexed Pomerelia from Poland into their monastic state, which already included historical Prussia. As a result of the Teutonic rule, in German terminology the name of Prussia was also extended to conquered Polish lands like Gdańsk Pomerania, although it was not inhabited by Baltic Prussians but Lechitic Poles. Meanwhile, the Ostsiedlung started to turn Slavic narrow Pomerania into an increasingly German-settled area; the remaining Wends and Polish people, often known as Kashubians, continued to settle within Pomerelia.Jan M Piskorski, Pommern im Wandel der Zeiten, 1999, pp.77ff, Werner Buchholz, Pommern, Siedler, 1999, pp.45ff, In 1325 the line of the princes of Rügen died out, and the principality was inherited by the Griffins.Werner Buchholz, Pommern, Siedler, 1999, pp.115,116,
In the 12th century, the Duchy of Pomerania (western part), as a vassal state of Poland, became Christian under saint Otto of Bamberg (the Apostle of the Pomeranians); at the same time Pomerelia (eastern part) became a part of diocese of Włocławek within Poland. Since the late 12th-early 13th century, the Griffin Duchy of Pomerania stayed with the Holy Roman Empire and the Principality of Rugia with Denmark, while Pomerelia, under the ruling of Samborides, was a part of Poland.Jan M Piskorski, Pommern im Wandel der Zeiten, 1999, pp.35ff, Gerhard Krause, Horst Robert Balz, Gerhard Müller, Theologische Realenzyklopädie, De Gruyter, 1997, pp.40ff, Werner Buchholz, Pommern, Siedler, 1999, p.34ff,87,103, Jan M. Piskorski, Pommern im Wandel der Zeiten, 1999, p.43, Pomerania, during its alliance in the Holy Roman Empire, shared borders with West Slavic state Oldenburg, as well as Poland and the expanding Margraviate of Brandenburg. In the early 14th century the Teutonic Knights invaded and annexed Pomerelia from Poland into their monastic state, which already included historical Prussia. As a result of the Teutonic rule, in German terminology the name of Prussia was also extended to conquered Polish lands like Gdańsk Pomerania, although it was not inhabited by Baltic Prussians but Lechitic Poles. Meanwhile, the Ostsiedlung started to turn Slavic narrow Pomerania into an increasingly German-settled area; the remaining Wends and Polish people, often known as Kashubians, continued to settle within Pomerelia.Jan M Piskorski, Pommern im Wandel der Zeiten, 1999, pp.77ff, Werner Buchholz, Pommern, Siedler, 1999, pp.45ff, In 1325 the line of the princes of Rügen died out, and the principality was inherited by the Griffins.Werner Buchholz, Pommern, Siedler, 1999, pp.115,116,