BARNIM I  . (c . 1209-1278), called the Good, was the son of Bogislaus II., duke of Pomerania-Stettin, and succeeded to this duchy on his father's death in 1220 . After he became of age he was engaged in a long struggle with external enemies, and in 1250 was compelled to recognize the supremacy of the margrave of Brandenburg . Having in 1264 united the whole of Pomerania under his rule, Barnim devoted his energies to improving its internal condition . He introduced German settlers and customs into the duchy, founded many towns, and was extremely generous towards ecclesiastical foundations . He died on the 13th or 14th of November 1278 .