Question: Alhfrith was King of Deira under his father, who was King of Bernicia following the death of which brother in 642?
Sentence (from "Eanfrith of Bernicia"): He was the son of Æthelfrith, a Bernician king who had also ruled Deira to the south before being killed in battle around 616 against Raedwald of East Anglia, who had given refuge to Edwin, an exiled prince of Deira.
Relevant evidence: No