Margraviate of Meissen
The Ascanian line of Saxe-Wittenberg became extinct with the death of Elector Albert III in 1422, whereafter Emperor Sigismund bestowed the country and electoral dignity upon Margrave Frederick IV of Meissen, who had been a loyal supporter in the Hussite Wars. Late Albert's Ascanian relative Duke Eric V of Saxe-Lauenburg protested in vain. Frederick, now one of the seven Prince-electors, was a member of the House of Wettin, which since 1089 had ruled over the adjacent Margraviate of Meissen up the Elbe river, established under Emperor Otto I in 965, and since 1242 also over the Landgraviate of Thuringia. Thus, in 1423, Saxe-Wittenberg, the Margraviate of Meissen and Thuringia were united under one ruler, and the unified territory.