13th July, 2007 Aethelfryth's Invasions Aethelfryth (also spelt Ethelfrith or Ethelfrid) came to prominence in the early 7th century. He united the Anglian kingdoms of Deira (Yorkshire) and Bernicia (south-east Scotland, Northumberland and Durham). The new kingdom became known as Northumbria . Aethelfryth was a ruthless war lord . Bede ,