There was a great slaughter both of the Church and the people of Northumbria, perpetrated by Cadwallon 1 and Penda 1.
Primary Source Info
Persons associated with this Event:
(King of Gwynedd, d.634) : With bestial cruelty he put all to death by torture and for a long time raged through all their land, meaning to wipe out the whole English nation from the land of Britain.
(King of the Mercians, 626/632-655) : He and the whole Mercian race were idolaters and ignorant of the name of Christ.