In which year, was the son Gofraid ua Ímair who had succeeded his father recently as king defeated by the English led by Æthelstan?
Olaf Guthfrithson:  He was the son of Gofraid ua Ímair and great-grandson of Ímar, making him one of the Uí Ímair. 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