[1] Eldest son and successor of Ordulf and Wulfhild of Norway, he was the last member of the House of Billung.

When this was refused he declined to appear, and was consequently deprived of Bavaria, while his Saxon estates were plundered.

However, he and the Saxons never fully supported the Swabian Rudolf and he reconciled with Henry, even fighting the Slavs with the royal forces.

Magnus was an embittered enemy of the archbishop of Bremen, Adalbert, whose see he afflicted with repeated plundering raids.

[5] The other half of his lands went to the house of Ascania via Eilika (1080 – 16 January 1142), who married Count Otto of Ballenstedt.