Claus Krag argued that an important motive was to establish a hereditary claim to Viken, the region around Oslo, because the area had been paying taxes to the King of Denmark.
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His mother, Þuríður, was a direct descendant of Þóra Magnúsdóttir daughter of Magnus III of Norway a direct descendant of Harald Fairhair (Haraldur hárfagri) founder of the Fairhair dynasty the first royal dynasty of the united Norway, and a branch of the Ynglings (also see Ynglinga saga).