Chapter XII.
How Edwin was persuaded to believe by a vision which he had once seen when he was in exile. [Circ. 616 A.D.]

pg. 116

"For as soon as the messengers had returned home, he raised a mighty army to subdue Ethelfrid; who, meeting him with much inferior forces, (for Redwald had not given him time to gather and unite all his power,) was slain on the borders of the kingdom of Mercia, on the east side of the river that is called Idle. In this battle, Redwald's son, called Raegenheri was killed."