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Son of Bernhard I, Herzog von Braunschweig-Lüneburg and Catherine Guelph Brother of Catherine Griffins Half brother of Otto IV "der Hinkende" von Braunschweig-Lüneburg, Fürst zu Lüneburg; Friedrich II, Herzog von Braunschweig-Lüneburg and Katharine of Brunswick-Lunenburg, Duchess of Pommerania