Obersachsen
When the Ascanian line in the Electorate of Saxony died out in 1422, the Ascanian Duke Eric V of Saxe-Lauenburg failed to assert his succession in Wittenberg. King Sigismund granted the Electorate to Margrave Frederick IV of Meissen from the House of Wettin, who united the Meissen and the Saxon lands of Wittenberg under his rule. He assumed the electoral title and thereby transferred the state of Saxony up the Elbe river to his Meissen residence. His lands were also called "Upper Saxony" (see: Upper Saxon Circle) to distinguish them from the territory of the medieval stem duchy, the later Lower Saxony. The territory of former Saxe-Wittenberg became known as the "Kurkreis" ("Electoral District"). By the division of the Saxon Electorate according to the 1485 Treaty of Leipzig, the Wittenberg lands including the electoral dignity fell to Ernest of Wettin.