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Eadulf IV or Eadwulf IV (died 1041) was the ruler of Bamburgh from 1038 until his death. He was a son of Uhtred the Bold and his second wife Sige, daughter of Styr Ulfsson. Eadwulf had one full sibling, a younger brother Gospatric. He succeeded his older half-brother Ealdred, who was murdered by the son of Thurbrand the Hold in a bloodfeud started when Thurbrand murdered Uhtred. The Anglo-Saxon Chronicle asserts that in 1041 Eadwulf was "betrayed" by King Harthacnut.[1] The "betrayal" seems to have been carried out by Siward, Earl of Northumbria; when the Libellus de exordio and other sources write about the same event, they say that Siward attacked and killed Eadulf.[2] Siward then became earl of all Northumbria, perhaps the first person to do so since Uhtred the Bold. Eadulf was the last of the ancient Bernician line of earls to rule until his son Osulf usurped the Northumbrian earldom in 1067.