Duchy of Saxony
With the removal of the Welfs in 1180, the Duchy of Saxony was sharply reduced in the territory. Westphalia fell to the Archbishop of Cologne, while the Duchy of Brunswick remained with the Welfs. The Ascanian Dukes had their base further east, near the Elbe, in what is sometimes called the "younger Duchy of Saxony", resulting in the name Saxony moving towards the east.