Edwin of Northumbria was a seventh-century Anglo-Saxon monarch who ruled the combined kingdoms of Deira and Bernicia from approximately 616 until 633. After surviving an early period of exile, he ascended to power with the support of the East Anglian king Rædwald. His reign was marked by significant territorial expansion and his status as the first king of the Northumbrian realm to adopt Christianity. He died fighting at the Battle of Hatfield Chase, where he was defeated by the forces of Cadwallon ap Cadfan and Penda of Mercia.