The Chronicle of The Kings of Norway
Part 12 - King Vemund Burnt To Death
After this battle (A.D. 868) King Harald subdued South More; but Vemund, King Audbjorn's brother, still had Firdafylke. It was now late in harvest, and King Harald's men gave him the counsel not to proceed south-wards round Stad.
Then King Harald set Earl Ragnvald over South and North More and also Raumsdal, and he had many people about him. King Harald returned to Throndhjem. The same winter (A.D. 869) Ragnvald went over Eid, and southwards to the Fjord district.
There he heard news of King Vemund, and came by night to a place called Naustdal, where King Vemund was living in guest-quarters. Earl Ragnvald surrounded the house in which they were quartered, and burnt the king in it, together with ninety men.
Then came Berdlukare to Earl Ragnvald with a complete armed long-ship, and they both returned to More. The earl took all the ships Vemund had, and all the goods he could get hold of. Berdlukare proceeded north to Throndhjem to King Harald, and became his man; and dreadful berserk he was.