Olaf II of Norway
Bjørn Farmann ("Bjørn the Tradesman", also called Bjørn Haraldsson, Farmand and Kaupman, died between 930 and 934) was a king of Vestfold. Bjørn was one of the sons of King Harald Fairhair of Norway. In late tradition, Bjørn Farmann was made the great-grandfather of Olaf II of Norway, through a son Gudrød Bjørnsson.