Aethelwald of Deira
After Oswine of Deira was killed by King Oswiu of Northumbria in 651, Aethelwald became king. He subsequently allied himself with Oswiu's enemy, Penda of Mercia; according to Bede, he acted as Penda's guide during the latter's invasion of Northumbria in 655. However, when the armies of Oswiu and Penda met on November 15 at the Battle of the Winwaed, Aethelwald withdrew his forces. Penda was defeated, perhaps in part because of this desertion, and afterward Aethelwald seems to have lost Deira to Alchfrith, who was installed there by the victorious Oswiu. Aethelwald's fate is unknown.
Although he allied himself with the pagan Penda, Aethelwald was nevertheless a pious Christian and was remembered for his generosity towards St. Chad, to whom he granted land for a monastery.
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