▁had ▁control ▁over ▁certain ▁regions . ▁Har ald ▁Gre yc lo ak ▁also ▁ruled ▁as ▁" over king " ▁of ▁his ▁brothers . ▁All ▁dates ▁for ▁the ▁k ings ▁of ▁the ▁Fair h air ▁dynast y ▁are ▁approximate ▁and / or ▁just ▁scholar ly ▁estimates . ▁S light ▁differences ▁might ▁therefore ▁occur ▁between ▁different ▁sources . ▁The ▁following ▁table ▁uses ▁the ▁dates ▁given ▁in ▁Nor sk ▁bi ograf isk ▁le ks ikon / Store ▁n ors ke ▁le ks ikon . ▁ ▁House ▁of ▁Kn ý t ling a / E ar l ▁of ▁La de ▁▁ ▁The ▁Dan ish ▁king ▁Har ald ▁Bl uetooth ▁had ▁himself ▁ha iled ▁as ▁king ▁of ▁Norway ▁after ▁the ▁Battle ▁of ▁F it jar ▁( ▁ 9 6 1 ). ▁Besides ▁gain ing ▁direct ▁control ▁of ▁V iken ▁in ▁south - e astern ▁Norway , ▁he ▁let ▁Har ald ▁Gre yc lo ak ▁rule ▁the ▁rest ▁of ▁Norway ▁as ▁king , ▁nomin ally ▁under ▁himself . ▁Har ald ▁Bl uetooth ▁later ▁switched ▁his ▁support ▁to ▁Har ald ▁Gre yc lo ak ' s ▁rival , ▁Ha ak on ▁Sig urd sson , ▁Earl ▁of ▁La de , ▁who ▁eventually ▁captured ▁Har ald ▁Gre yc lo ak ' s ▁kingdom . ▁Ha ak on ▁there after ▁ruled ▁Norway ▁( except ▁V iken ), ▁at ▁first ▁nomin ally ▁under ▁Har ald . ▁All ▁dates ▁are ▁estimates ▁and ▁subject ▁to ▁interpretation . ▁Ha ak on ▁is ▁generally ▁held ▁as ▁the ▁r uler ▁of ▁Norway ▁from ▁ 9 7 0 ▁to