Meanwhile, the Bamberg estates were devastated in the Thirty Years' War. Bishop Johann Georg fled to his remote Carinthian estates in 1631 and his successor Franz von Hatzfeld was likewise expelled, when the Bamberg and Würzburg bishoprics was placed under the jurisdiction of Prince Bernard of Saxe-Weimar, who obtained the title of a "Duke of Franconia" from the hands of the Swedish chancellor Axel Oxenstierna in 1633. The prince-bishops were able to return and recover their possessions after Bernard's defeat at Nördlingen 1634.