Sweyn, to avenge on that lady and her grandson, Olvir Rosta, the burning of his own father Olaf and of his house in Duncansby, openly asked Jarl Ragnvald for "two ships well fitted and manned," sailed to the Moray Firth, the Breithifiorthr or Broadfirth, as it was then called, "and took the north-west wind to Dufeyra, a market town in Scotland. Thence he sailed into the land along the shore of Moray and to Ekkjals-bakki. Thence he fared next of all to Athole to Earl Maddad, and lay at the place called Elgin and obtained guides, who knew the paths over fells and wastes whither he wished to go.[19] Thence he fared the upper way over fells and woods, above all places where men dwelt, and came out in Strath Helmsdale near the middle of Sutherland. But Olvir and his men had scouts out everywhere where they thought that strife was to be looked for from the Orkneys; but in this way they did not look for warriors. So they were not ware of the host, before Sweyn and his men had come to the slope at the back of Frakark's homestead. There came against them Olvir the Unruly with sixty men; then they fell to battle at once, and there was a short struggle. Olvir and his men gave way towards the homestead; for they could not get to the wood. Then there was a great slaughter of men, but Olvir fled away up to Helmsdale Water and swam across the river and so up on to the fell: and thence he fared to Skotland's Firth,[20] and so out to the Southern Isles. And he is out of the story. But when Olvir drew off, Sweyn and his men fared straight up to the house, and plundered it of everything; but, after that, they burnt the homestead and all those men and women who were inside it. And there Frakark lost her life. Sweyn and his men did there the greatest harm in Sutherland, ere they fared to their ships." Such is this Sutherland tale of Sweyn. According to the current notions of blood feud, he merely discharged the solemn duty of avenging his father's burning and death by a like burning and slaying of the household of his father's murderers. But his acts were wholly unjustifiable by the law of the time, as he had already accepted an atonement by were-geld from Earl Ottar. After a round of harrying and piracy, especially in Sutherland, no doubt among the Moddan clan, Sweyn was heartily welcomed home by Jarl Ragnvald, from whom he immediately obtained another fleet for another set of raids on Wales, the coasts of the Bristol Channel and the Scilly Isles. His murder of Sweyn Breast-rope was committed just after an adjournment of the feast at Orphir for Nones in the Templar Church there, and Jarl Ragnvald's gift of the ships for Frakark's punishment was made while the jarl was piously engaged in completing and adorning St. Magnus' Cathedral at Kirkwall.