John, Duke of Brunswick-Lüneburg German noble (1242–1277) Parents Matilda of Brandenburg, Duchess of Brunswick-Lüneburg Otto the Child Children Agnes von Braunschweig-Lüneburg Maud von Braunschweig-Lüneburg Otto II, Duke of Brunswick-Lüneburg Helen von Braunschweig-Lüneburg Elisabeth von Braunschweig-Lüneburg Siblings Helene of Brunswick-Lüneburg Adelaide of Brunswick-Lüneburg Mathilde of Brunswick-Lüneburg Otto I of Brunswick-Lüneburg Albert I, Duke of Brunswick-Lüneburg Conrad of Brunswick-Luneburg Elisabeth of Brunswick-Lüneburg Agnes of Brunswick-Lüneburg Partners Luitgarde of Holstein-Itzehoe