Penda of Mercia
During 632 or 633, Edwin of Northumbria was overthrown and slain and his kingdom was ravaged by Cadwallon ap Cadfan, supported by Penda of Mercia. The Mercians then turned on the East Angles and their king, Ecgric. In 640 or 641, they routed the East Anglian army in a battle in which Ecgric and his predecessor Sigeberht both perished.