Obersachsen
Following the downfall of Henry the Lion (11291195, Duke of Saxony 11421180), and the subsequent splitting of the Saxon tribal duchy into several territories, the name of the Saxon duchy was transferred to the lands of the Ascanian family. This led to the differentiation between "Lower Saxony" (lands settled by the Saxon tribe) and "Upper Saxony" (the lands belonging to the House of Wettin). Gradually, the latter region became known as "Saxony", ultimately usurping the name's original geographical meaning. The area formerly known as Upper Saxony now lies in Central Germany - in the eastern part of the present-day Federal Republic of Germany: note the names of the federal states of Saxony and Saxony-Anhalt.