Within weeks of Athelstan death on 27 October 939, Olaf Guthfrithson of Dublin — who had fought at Brunanburh — sailed back to England and seized York. The young King Edmund I, Athelstan brother, could not prevent the recapture. This dramatic reversal illustrated how dependent English supremacy in the north had been on Athelstan personal authority. Northumbria would not be permanently English until 954.
Dublin Norse fleet and army under Olaf Guthfrithson
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