Cnut had left Norway under the rule of Håkon Eiriksson, but he was drowned in 1029, and Cnut appointed his son Svein to rule Norway with the assistance of Ælfgifu, Cnut's first wife and Svein's mother. However, they made themselves unpopular by heavy taxation and favouring Danish advisers over the Norwegian nobles, and when King Magnus I of Norway, the son of the former King of Norway, Olaf, invaded in 1035, they were forced to flee to Harthacnut's court. Harthacnut was a close ally of Svein, but he did not feel his resources were great enough to launch an invasion of Norway, and the half-brothers looked for help from their father, but instead they received news of his death in November 1035.