BARNIM III. (c. 1303-1368), called the Great, was the son of Otto I., duke of Pomerania-Stettin, and took a prominent part in the defence and government of the duchy before his father's death in 1344. A victory gained by him in August 1332 freed Pomerania for a time from the vexatious claim of Brandenburg to supremacy over the duchy, which, moreover, he extended by conquest. Barnim assisted the emperor Charles IV. in his struggle with the family of Wittelsbach.