Background
He was a son of Oswiu of Northumbria and a brother of Ecgfrith of Northumbria. Aelfwine was still a boy at the time, and the title may have been intended to designate him as the heir of the childless Ecgfrith.
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Aelfwine Deira
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After the succession of Ecgfrith as king of Northumbria in 670, he made Aelfwine king of the sub-kingdom of Deira. He was, however, killed in battle against the Mercians at the Battle of the Trent in 679. Although his death could have led to an escalation of the war, further conflict was averted by the intervention of the Archbishop of Canterbury, Theodore, and King Æthelred of Mercia paid a weregild to Ecgfrith in compensation for Aelfwine"s death.
