Question: What was the name of the father of the Norwegian king at the center of the Saga of Harald Fairhair?

Context paragraphs:
Gudrød the Hunter: Gudrød the Hunter (Old Norse: "Guðrǫðr veiðikonungr", Norwegian: "Gudrød Veidekonge", litterary "Gudrod Hunterking"), also known as the Magnificent (Old Norse: "enn gǫfugláti", Norwegian: "den gjeve"), is a legendary character portrayed in the Norse sagas as a Norwegian petty king in the early 9th century.  According to the sagas, he was the father of Halfdan the Black, and thus the grandfather of Harald Fairhair, the first king of unified Norway.  He is considered by modern historians to be of a more mythical nature than other ancestors of Harald and Halfdan, and he can not be identified historically.  Historians have in turn made a number of proposals seeking to identify him with various would-be contemporary historical figures.

Björn Eriksson: Björn (ruled 882–932) was the father of Olof (II) Björnsson and Eric the Victorious, and he was the grandfather of Styrbjörn the Strong, according to the "Hervarar saga" and "Harald Fairhair's saga".  According to the two sagas, he was the son of an Erik who fought Harald Fairhair and who succeeded the brothers Björn at Hauge and Anund Uppsale:

Kjotve the Rich: Kjotve the Rich (Old Norse: "Kjötvi hinn auðgi", Norwegian: "Kjotve den Rike") was a king of Agder, then one of the petty kingdoms of Norway during the late 9th century.  Kjotve led the western Norwegian kings against King Harald Fairhair ("Harald Hårfagre") at the Battle of Hafrsfjord ("Slaget i Hafrsfjorden").  Defeated by Harald, Kjotve fled; many of his allies were killed in the battle.

Harald Fairhair: Harald Fairhair (Old Norse: "Haraldr Hárfagri", Norwegian: "Harald Hårfagre", (literally "Harald Fair-hair") ;  850 –  932) is remembered by medieval historians as the first King of Norway.  According to traditions current in Norway and Iceland in the twelfth and thirteenth centuries, he reigned from  872 to 930.  Most of his life remains uncertain, since the extant accounts of his life in the sagas were set down in writing around three centuries after his lifetime.  A few remnants of skaldic praise poems attributed to contemporary court poets exist which seem to refer to Harald's victories against opponents in Norway.  The information supplied in these poems is inconsistent with the tales in the sagas in which they are transmitted, and the sagas themselves often disagree on the details of his background and biography.  Two of his sons, Eric Bloodaxe and Haakon the Good, succeeded Harald to become kings after his death.

Olvir Hnufa: Olvir Hnufa or Ölvir hnúfa was a Norwegian hersir and skald of the late ninth and early tenth centuries, known from, among other sources, "Egil's Saga", "Skaldatal" and the "Prose Edda".  Olvir was the son of the viking Berle-Kari and brother-in-law of Kveldulf Bjalfason, who married Olvir's sister Salbjorg Karadottir; he was thus uncle to Skallagrim and Thorolf Kveldulfsson and great uncle to the famous poet Egil Skallagrimsson.  Olvir also had a brother named Eyvind Lambi.  Olvir was a prominent member of the court of King Harald Fairhair, who united Norway under his rule in the late ninth or early tenth century.  Among other famous skalds, he served as one of King Harald's court poets.  He also served as a warrior in Harald's retinue, and fought at the pivotal Battle of Hafrsfjord on the king's flagship.  He is best known for his involvement in the conflict between Harald and Olvir's kinsman Thorolf Kveldulfsson, which ended with the latter's death.  Only a few fragments of Olvir's poetry survive.

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.

Jón korpur Hrafnsson: Jón korpur Hrafnsson (born 1255) (Anglicized John "the raven" son of Raven) son of Þuríður Sturludóttir (born 1228) and Hrafn Oddsson (born 1225).  His mother, Þuríður, was a direct descendant of Þóra Magnúsdóttir daughter of Magnus III of Norway a direct descendant of Harald Fairhair (Haraldur hárfagri) founder of the Fairhair dynasty the first royal dynasty of the united Norway, and a branch of the Ynglings (also see Ynglinga saga).  His father, Hrafn, on the other hand was a direct descendant of Skalla-Grímr father of skald and Viking Egill Skallagrímsson.  With the birth of Jón korpur Hrafnsson the warring clans of the Fairhair dynasty and Skalla-Grímr were genetically united in Iceland.

Gyda Eiriksdatter: Gyda Eiriksdottir of Hordaland ("Gyða Eiríksdóttir") was a semi-legendary Norwegian queen consort during the Viking Era.  She appears in the Saga of Harald Fairhair ("Harald Hårfagres saga") in Snorri Sturluson's "Heimskringla".

Tora Mosterstong: Tora Mosterstong ("Þóra Morsturstöng") — also known as Thora Mostaff — was one of Harald Fairhair's concubines and the mother of Håkon the Good; Harald Fairhair's youngest son and the third King of Norway (c. 935–961).

Saga of Harald Fairhair: Saga of Harald Fairhair is the third of the sagas in Snorri Sturluson's Heimskringla, after Ynglinga saga and the saga of Halfdan the Black.  Snorri sagas were written in Iceland in the 1220s.  The saga is about the Norwegian king Harald Fairhair.

Supporting paragraphs: Saga of Harald Fairhair Halfdan the Black
Answer: Halfdan the Black