Æthelfrith of Bernicia progressively absorbed Deira by force and diplomacy, marrying the Deiran princess Acha and expelling or killing rival Deiran princes. Edwin of Deira was driven into long exile visiting multiple kingdoms. The union of Bernicia and Deira under Æthelfrith created the Northumbrian kingdom that would dominate Britain for decades.
Aubrey generates in-depth historical research for any location in Britain — drawing on Domesday records, scheduled monuments, Victorian OS maps, geological data and archaeological archives to tell the full story of a place.
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