According to German folklore the banner of Widukind, the last pagan King of the Old Saxons, was a jumping black horse on a yellow field. After the defeat of Saxony and his conversion to Christianity the banner was changed to a jumping white horse on a red field. This device was adopted by Henry the Lion, the Duke of Saxony (r. 1142–1180). The Archbishop of Cologne also used the device on his seal for his possessions which were in the former lands of the Saxons. In the 17th Century these territories in Westphalia came into the possession of the House Saxe-Lüneburg which continued the use of this device. The is also found in the arms of the Kingdom of Prussia, Kingdom of Hanover and Duchy of Brunswick and today used in the contemporary arms of the federal-state of North Rhine-Westphalia.