 Guðrøðr's apparent Uí Ímair antecedents appear to have endowed him with ancestral claims to the Norse-Gaelic kingdoms to Dublin and the Isles.In the 1070s, he secured the kingship of the Isles through his conquest of Mann, and forcefully added Dublin to his realm in 1091.Guðrøðr's downfall came in 1094, when he was driven out of Ireland by the Uí Briain, and died the following year in the Hebrides.