The Chronicle of The Kings of Norway
Part 13 - Quarrels Of King Magnus And King Inge
Steinkel, the Swedish king, died about the same time (A.D. 1066) as the two Haralds fell, and the king who came after him in Svithjod was called Hakon. Afterwards Inge, a son of Steinkel, was king, and was a good and powerful king, strong and stout beyond most men; and he was king of Svithjod when King Magnus was king of Norway. King Magnus insisted that the boundaries of the countries in old times had been so, that the Gaut river divided the kingdoms of the Swedish and Norwegian kings, but afterwards the Vener lake up to Vermaland.
Thus King Magnus insisted that he was owner of all the places lying west of the Vener lake up to Vermaland, which are the districts of Sundal, Nordal, Vear, and Vardyniar, with all the woods belonging thereto. But these had for a long time been under the Swedish dominion, and with respect to scat were joined to West Gautland; and, besides, the forest- settlers preferred being under the Swedish king.
King Magnus rode from Viken up to Gautland with a great and fine army, and when he came to the forest-settlements he plundered and burnt all round; on which the people submitted, and took the oath of fidelity to him. When he came to the Vener lake, autumn was advanced and he went out to the island Kvaldinsey, and made a stronghold of turf and wood, and dug a ditch around it. When the work was finished, provisions and other necessaries that might be required were brought to it.
The king left in it 300 men, who were the chosen of his forces, and Fin Skoptason and Sigurd Ulstreng as their commanders. The king himself returned to Viken.