Svend I de Dinamarca
Olof was victorious alongside Sweyn Forkbeard when the kings created an alliance to defeat the Norwegian king Olaf Tryggvason in the Battle of Svolder. After the battle, the victorious leaders split Norway into areas of control. Heimskringla gives the most detailed account of the division. Olof received four districts in Trondheim as well as Møre, Romsdal and Rånrike.