In which year, was the son Gofraid ua Ímair who had succeeded his father recently as king defeated by the English led by Æthelstan?
Battle of Brunanburh: The Battle of Brunanburh was fought in 937 between Æthelstan, King of England, and an alliance of Olaf Guthfrithson, King of Dublin; Constantine, King of Alba and Owen, King of Strathclyde.
i don't know