 The chronicle states that Óláfr then married Christina , daughter of Ferchar mac an t @-@ sagairt ( d. c . 1251 ) . Óláfr 's father @-@ in @-@ law emerges from historical obscurity in 1215 and , by the mid 1220s ( about the time of , or not long after , the marriage ) , Ferchar had obtained the Earldom of Ross from Alexander II , King of Scots ( d . 1249 ) for his part in defeating the Meic Uilleim northern rebellion in 1215 . The chronicle declares that Óláfr 's separation from Lauon had enraged her sister , and Rögnvaldr 's bitter queen sought to sow discord between the half @-@ brothers . If the chronicle is to be believed , the queen secretly wrote under her husband 's name to their son Guðrøðr , ordering him to seize and kill Óláfr . The chronicle states that Guðrøðr dutifully gathered a force on Skye and proceeded to Lewis , where he laid waste to most of the island before returning to Skye — Óláfr had narrowly escaped with a few men and fled to the protection of his father @-@ in @-@ law , on the mainland in Ross . 
