In 1309 he lost his position as governor following the invasion of Eastern Pomerania by Teutonic Knights.
As a potential successor Casimir III the Great on the throne of Poland, Siemowit II agreed to waive the rights of Chełmno and Eastern Pomerania.
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Eastern Pomerania was the Duchy of Pomerelia, which spit into others including Kashubian-speaking areas west of Gdańsk.
Magdeburg law was popular around the March of Meißen and Upper Saxony and was the source of several variants, including Neumarkt-Magdeburg law (Środa Śląska), used extensively in Upper Silesia, and Kulm law, used in the territory of the Teutonic Knights in Prussia and along the lower Vistula in Eastern Pomerania.
Mestwin I, Duke of Pomerania (1160–1217/1220), Duke of Eastern Pomerania in 1207–1220