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.
Harald Sigtryggsson Harald Sigtryggsson (Old Irish: "Aralt mac Sitric" ; Old Norse: "Haraldr" , died 940) was a Viking leader who ruled Limerick in the early 10th century. He was the son of Sitric Cáech and great-grandson of Ímar, making him one of the Uí Ímair. He was installed as king of Limerick following the capture of the previous king Olaf Scabby-head by Harald's cousin Olaf Guthfrithson, king of Dublin, during a battle at Lough Ree in 937. Harald died in 940 and was ultimately succeeded by Ivar of Limerick.