What was the name of the father of the Norwegian king at the center of the Saga of Harald Fairhair?
Halfdan the Black Halfdan the Black (Old Norse: "Halfdanr Svarti") (  810 –  860 ) was a ninth-century king of Vestfold. He belonged to the House of Yngling and was the father of Harald Fairhair, the first king of Norway.
Ingeborg Tryggvasdotter Ingeborg Tryggvasdotter was the daughter of Tryggve Olafsson (died 963), the granddaughter of Harald Fairhair, and the sister of Olaf I of Norway.