Matilda of Brandenburg, Duchess of Brunswick-Lüneburg German duchess (1210–1261) Parents Matilda Von Groitzsch Albert II, Margrave of Brandenburg Children Helene of Brunswick-Lüneburg Agnes of Brunswick-Lüneburg Elisabeth of Brunswick-Lüneburg Bishop Otto I of Brunswick-Lüneburg Mathilde of Brunswick-Lüneburg Albert I, Duke of Brunswick-Lüneburg Conrad of Brunswick-Luneburg Adelaide of Brunswick-Lüneburg John, Duke of Brunswick-Lüneburg Siblings Otto III, Margrave of Brandenburg John I, Margrave of Brandenburg Elisabeth of Brandenburg, Landgravine of Thuringia Jutta von Brandenburg Partners Otto the Child
