Pomerania was a duchy in the NE of the HRE. Originally (if sparely) settled by Slavic people, German settlers went there and gradually took over. Since 1240, this would happen even faster than in OTL. In 1260, the western half of Farther Pomerania (east of Oder river) was germanized, and in 1270, the whole country was. While the duchy was originally under the influence of nearby, earlier settled Brandenburg, the uprising of anti-king Waldemar of Brandenburg and his latter defeat against Ottokar II in 1328 made Brandenburg lose it again.