There was an Upland man called Markus of Skog, who was a relation of Earl Sigurd. Markus brought up a son of King Sigurd Mun, who was also called Sigurd. This Sigurd was chosen king (A.D. 1162) by the Upland people, by the advice of Earl Sigurd and the other chiefs who had followed King Hakon.
They had now a great army, and the troops were divided in two bodies; so that Markus and the king were less exposed where there was anything to do, and Earl Sigurd and his troop, along with the lendermen, were most in the way of danger. They went with their troops mostly through the Uplands, and sometimes eastwards to Viken. Erling Skakke had his son King Magnus always with him, and he had also the whole fleet and the land defence under him.
He was a while in Bergen in autumn; but went from thence eastward to Viken, where he settled in Tunsberg for his winter quarters (A.D. 1163), and collected in Viken all the taxes and revenues that belonged to Magnus as king; and he had many and very fine troops. As Earl Sigurd had but a small part of the country, and kept many men on foot, he soon was in want of money; and where there was no chief in the neighbourhood he had to seek money by unlawful ways, — sometimes by unfounded accusations and fines, sometimes by open robbery.