The kinly line [of Norway], which Snorri [Sturlusson, 13th century historian] traces claimed descent from the ancient Yngling kings who ruled at Uppsala in Sweden. Their legendary Yngling ancestor was Olof Tretelgia Ingjaldsson, who had escaped the aftermath of his father's conflagration by fleeing to Norway.
Her King Olof earned his nickname, which means "the Woodcutter", by clearing the forest and cultivating the land. He named his new domain Varmland and such a large group of Swedes followed him there "that the land could not give them sustenance."
After a season of bad harvests, the woodcutting king was sacrificed to Odin so that his people might have good crops. He was succeeded by his son Halfdan Whiteleg, who is said to have extended his rule over much of southern Norway.
[Royal Families of Medieval Scandinavia, Flander & Kiev]