Since the death of Oswald's uncle Edwin of Northumbria at Hatfield Chase in 633, the Mercians under Penda had presented an obstacle to the power of Northumbria over the lands of Britain south of the Humber. Oswald had defeated Cadwallon ap Cadfan of Gwynedd, King of the Britons (Penda's ally at Hatfield) at Heavenfield in 634, and subsequently re-established Northumbrian hegemony across much of Britain; although it is thought that Penda recognized Oswald's authority in some form after Hatfield, he may nevertheless have been hostile to Northumbrian power or at least perceived by Oswald as a threat.[citation needed]
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