In 1006, Brian mustered a massive force in southern Ireland and marched throughout the north of the island in a remarkable show of force [REF].
Whilst Ragnall may have been driven from the Isles by Sigurðr's encroachment,[REF] it is also possible that it was Ragnall's overseas death-and a resultant power vacuum-that lured Orcadian comital power into the realm [REF].