Arrived amongst the islands he soon cleared them of the Vikings, who found in Einar a far more formidable opponent than the indolent and peaceful Hallad. His promise to his father he kept to the letter, and he saw his face no more; though when the increasing favour shewn to Rognwald so provoked the jealousy of two of Harold’s sons that they burnt the Jarl in his own house, Einar gloried in becoming his avenger. Halfdan, one of the murderers, flying from the vengeance of his incensed father, arrived so unexpectedly at the Orkneys that Einar was taken by surprise and had barely time to escape to the mainland; but his absence was of short duration, and surprising Halfdan in his turn, he seized upon the wretched prince, inflicting on him the cruel death of the Spread-eagle. Whatever punishment Harfager might have intended for his son, he was exasperated on learning that Einar had forestalled him, and immediately prepared a fleet for an expedition against the Orkneys; but he suffered himself in the end to be diverted from his intention, and was eventually satisfied with the exaction of a heavy fine from the islands. Einar, however, turned even the intended punishment to his own advantage, undertaking to pay the whole sum on condition that the Odallers or Freeholders resigned their Odal rights in his favour, or in other words submitted to be taxed and to hold their lands of the Jarl; and from the date of this arrangement all the lands in the earldom remained for many years the sole property of the Jarls. The rest of Einar’s life was passed in undisturbed possession of the earldom he had so unexpectedly acquired; and upon his death it was equally divided, according to the ancient custom, amongst his three surviving sons. Arnkel and Erlend, the two eldest, followed the fortunes of Eric Blodæxe, losing their lives in his service, when the whole earldom was again reunited under the sole authority of the surviving brother Thorfin the Skull-cleaver. In spite of his formidable name, Thorfin was of a peaceful character, resembling his uncle Hallad in his aversion to war, rather than his father Einar; and when the sons of Eric arrived in the Orkneys with the shattered remnants of their followers, he at once acknowledged their claim to his allegiance, submitting without a struggle to their authority;[98] though they soon released him from further annoyance by sailing for Norway to try their fortunes in their ancestral dominions, when Thorfin ruled his earldom in peace, dying about the commencement of Kenneth’s reign.[99] He married Grelauga, a daughter of Duncan Mormaor of Caithness, by Groa, the sister of Thorstein Olaveson, and upon his death left five sons to inherit his island earldom, and possibly with some claims upon the mainland inheritance of their maternal grandfather.[100]