Chapter Iv.--Thorfinn, Earl and Jarl

1008-1064--King Malcolm's matrimonial alliances--Victory of Carham--Thorfinn Sigurdson, Earl of Caithness and Sutherland--His attempts on Orkney--Somarled, Brusi and Einar--Thorkel Fostri slays Einar--Moddan created Earl of Caithness and slain by Thorkel--Battle of Torfness--Death of Duncan--Thorfinn and Macbeth--Thorfinn and Ragnvald Brusison--Marriage with Ingibjorg--Battle of Rautharbiorg-- Thorfinn sole Jarl of Orkney and Shetland--His travels, retirement, and death--His chronology.