Question: In which year, was the son Gofraid ua Ímair who had succeeded his father recently as king defeated by the English led by Æthelstan?
Sentence (from "Battle of Brunanburh"): Additionally, historians such as Michael Livingston argue that "the men who fought and died on that field forged a political map of the future that remains [in modernity], arguably making the Battle of Brunanburh one of the most significant battles in the long history not just of England, but of the whole of the British Isles."
Relevant evidence: No