 At one point Óláfr , who had been given possession of Lewis , complained to Rögnvaldr that his lands were not enough . Rögnvaldr 's response was seize Óláfr and send him to the King of Scots , where he was imprisoned for almost seven years . Upon his release , Óláfr undertook a pilgrimage to Santiago de Compostela , after which the half @-@ brothers were reconciled and Rögnvaldr had Óláfr married to Lauon , the sister of his own wife . Sometime after 1217 this marriage was nullified by Reginald , Bishop of the Isles , who may have been an ally of Óláfr against Rögnvaldr . Óláfr then married Christina , a daughter of the King of Scots ' protégé Ferchar , Earl of Ross . The chronicle claims that Rögnvaldr 's bitter wife tricked their own son , Guðrøðr , into attempting to kill Óláfr ; however , Óláfr narrowly escaped with his life and fled to the protection of his father @-@ in @-@ law on the mainland . Together with a loyal follower , one Páll Bálkason , Óláfr later defeated Guðrøðr on Skye . 
