Principality of Brunswick-Wolfenbüttel
Albert I (also called Albert the Tall) (1236-1279) was given the regions around Brunswick-Wolfenbüttel, Einbeck-Grubenhagen and Göttingen-Oberwald. He thus founded the Old House of Brunswick and laid the basis for what became, later, the Principality of Brunswick-Wolfenbüttel. His brother John (1242-1277) inherited the land around Lüneburg and founded the Old House of Lüneburg. The town of Brunswick remained under joint rule.