Question: Alhfrith was King of Deira under his father, who was King of Bernicia following the death of which brother in 642?
Sentence (from "Alhfrith"): Alhfrith or Ealhfrith (c. 630 – c. 664) was King of Deira under his father Oswiu, King of Bernicia, from 655 until sometime after 664.
Relevant evidence: Yes