
Herzog zu Braunschweig-Lüneburg, Fürst von Lüneburg
Brunswick
Holy Roman Empire
St. Michaelis
Johann I. (* 1. January 1242; † 13. December 1277 in Brunswick) was a herzog zu Braunschweig-Lüneburg, Fürst von Lüneburg. He was 35 years old. He had at least 1 child (1 son). He was buried at St. Michaelis.