Nikolas was a son of Sigurd Hranason and of Skialdvor, a daughter of Brynjolf Ulfalde, and a sister of Haldor Brynjolfson by the father's side, and of King Magnus Barefoot by the mother's side. Nikolas was a distinguished chief, who had a farm at Ongul in Halogaland, which was called Steig. Nikolas had also a house in Nidaros, below Saint Jon's church, where Thorgeir the scribe lately dwelt. Nikolas was often in the town, and was president of the townspeople. Skialdvor, Nikolas's daughter, was married to Eirik Arnason, who was also a lenderman.