In spite of his father's long reign, and his powerful uncle, Oswulf did not hold the throne for long. He was murdered within a year of coming to power, by members of his household, by his servants or bodyguards, at Market Weighton, on 24 July 759.
The death of Oswulf's brother, Oswine, is recorded at "Eldunum near Mailros" in August 761, in battle against Æthelwald Moll, who had seized the throne on Oswulf's death.
Further reading
Higham, N.J., The Kingdom of Northumbria AD 350–1100. Stroud: Sutton, 1993. ISBN0-86299-730-5
Marsden, J., Northanhymbre Saga: The History of the Anglo-Saxon Kings of Northumbria. London: Cathie, 1992. ISBN1-85626-055-0