Following the battle , Deira , in the southern part of Northumbria , chose a king of its own , Oswine , while Bernicia in the north ( which had been dominant , with Oswald , a member of the Bernician royal line , ruling both Bernicia and Deira prior to Maserfield ) was ruled by Oswald 's brother Oswiu .
Following the battle , Deira , in the southern part of Northumbria , chose a king of its own , Oswine .