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.
Oldest Saga of St. Olaf The Oldest Saga of St. Olaf or the First Saga of St. Olaf is one of the kings' sagas. It is the earliest Norse biography of King Óláfr Haraldsson. Early scholars judged it to be among the very first sagas written, perhaps around 1160, but later scholarship has moved the date up to the end of the 12th century. One fragment with a hagiographic flavour was once thought to belong to the saga but more recent research indicates that it is from another text. Like other kings' sagas the "Oldest Saga" cites old skaldic poetry to decorate and verify the narrative.