Duchy of Franconia
With the Thirty Years' War raging, Swedish troops occupied the Prince-Bishopric of Bamberg and Franz von Hatzfeld fled to Cologne as a protective measure. On 20 June 1633 Lord High Chancellor of Sweden Axel Oxenstierna declared that the Prince-Bishopric of Bamberg and the Prince-Bishopric of Würzburg would henceforth be combined as the "Duchy of Franconia" and enfeoffed to Bernard of Saxe-Weimar.