Eric I, Duke of Brunswick-Grubenhagen Duke of the Principality Grubenhagen (1380–1427) Parents Agnes of Brunswick-Lüneburg Albert I, Duke of Brunswick-Grubenhagen Children Albert II, Duke of Brunswick-Grubenhagen Sophie von Braunschweig-Grubenhagen Ernest II, Duke of Brunswick-Grubenhagen Margaret of Brunswick-Grubenhagen Anna of Brunswick-Grubenhagen-Einbeck Henry III, Duke of Brunswick-Grubenhagen Elisabeth of Brunswick-Grubenhagen Agnes of Brunswick-Grubenhagen Partners Elisabeth of Brunswick-Göttingen