Helene of Brunswick-Lüneburg (1223-1273) (1223–1273) Parents Matilda of Brandenburg, Duchess of Brunswick-Lüneburg Otto the Child Children Helena of Saxony John I, Duke of Saxony Albert II, Duke of Saxony Siblings Mathilde of Brunswick-Lüneburg Adelaide of Brunswick-Lüneburg John, Duke 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 Hermann II Albert I, Duke of Saxony