Question: Alhfrith was King of Deira under his father, who was King of Bernicia following the death of which brother in 642?
Sentence (from "Oswiu"): Oswiu, also known as Oswy or Oswig (Old English: "Ōswīg" ) (c. 612 – 15 February 670), was King of Bernicia from 642 until his death.
Relevant evidence: Yes