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Have Harald Hardrada not return to Norway. Preferly have him stay in Byzantium.
Harald Hardrada had a succesfull career serving in the Varangian Guard of the Byzantine emperors. Later he used the valueables that he had built up during his service to return to Norway. First he became co king with his nephew. Later when that nephew died he became king of Norway properly. At the end of Harald's life he attempted to conquer England, during which he died. https://en.wikipedia.org/wiki/Harald_Hardrada
What if Harald Hardrada did not leave Byzantium? How would Norwegian and English politics be impacted?
What could prevent Harald from returning to Norway, besides dying?