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 +16 death in 1344 . A long and intermittent struggle with the representatives of the emperor Louis IV., who had invested his own son Louis with the mark of Brandenburg, enabled him to gain military experience and distinction . A victory gained by him in August 1332 was mainly instrumental in freeing 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 . He died on the 24th of August 1368 .