King Hereafter, File Number: ISBN # 0-375-70403-5 @ son of Gudrod, King in Norway, son of Eirik Bloodaxe.
The cited information was published by Vintage Books, div. of Random House, New York, 1982 (Ref: son of Gudrod, King in Norway, son of Eirik Bloodaxe.) The author/originator was Dorothy Dunnett.