in 948. In 974 a Danish uprising took place and the Margrave was killed, but shortly thereafter Duke Bernard I of Saxony and Count Henry I of Harsefeld/Stade pushed them back. The Danes succeeded in pushing the border back to the Eider during the Slavic revolts of 983. Initially the border remained, but was continually fought over.

In 1025 Cnut the Great's daughter Gunhild