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Thorbjorn was married to the sister of Sweyn Asleifsson, but they first quarrelled after Sweyn attacked Thorbjorn's cousin, Olvir Rosta, and grandmother, Frakkok, and burned her to death inside her house. Earl Rognvald Kali Kolsson forced a reconciliation, and the two went plundering together in the Hebrides, but fell out again over the distribution of the loot. Thorbjorn had his marriage annulled and entered Rognvald's service.
Later, serving Harald Maddadsson, Thorbjorn found himself again thrown into Sweyn's company.
In 1158, Thorbjorn was outlawed by Rognvald for murdering one of his retainers. He placed his faith in his friendship with Harald, but the two Earls had recently become allies, and Thorbjorn was in a very dangerous position. He attempted to resolve it by ambushing and assassinating Ranald; but Harald had him put to death.
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