Crawford, Barbara E. Thorfinn Sigurdson (II) [Þorfinnr Sigurðarson, Þorfinnr inn...
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Crawford, Barbara E. Thorfinn Sigurdson (II) [Þorfinnr Sigurðarson, Þorfinnr inn Ríki (c. 1009–c. 1065). Oxford Dictionary of National Biography. United Kingdom: Oxford University Press (2004), citing, “…Thorfinn faced attack from a powerful ruler of Scotland, called in the saga Karl Hundason, who claimed Caithness and expected tribute to be paid for it by the earl. The claim on Caithness, and thelocation of the movement of the armies of both Earl Thorfinn and King Karl around the Moray Firth make it very likely that the Scottish rival was a ruler of the province of Moray,…He was clearly a famous warrior and the battles fought with Thorfinn—one in Orcadian waters, off Deerness, and the other near Karl's own home base at 'Torfness' (possibly Tarbat Ness in Easter Ross)—were close-won victories for Thorfinn.”Thorfinn Sigurdson