 He was succeeded as Earl of Bernicia by his brother, another Eadwulf.The "Anglo-Saxon Chronicle" asserts that in 1041 Eadwulf was "betrayed" by King Harthacnut.The "betrayal" seems to have been carried out by Siward, Earl of Northumbria; since when the "Libellus de Exordio" and other sources write about the same event, they say that Siward attacked and killed Eadulf.