https://en.wikipedia.org/wiki/Eadwulf_II_of_Northumbria

Eadwulf or Eadulf was a ruler in Northumbria in the early tenth century. According to genealogy of Waltheof, Earl of Northampton , Eadwulf was the son of Æthelthryth daughter of Ælla, King of Northumbria--though this genealogy is not a contemporary one.[1]

The history of Northumbria in the ninth and tenth centuries is poorly recorded. English sources generally date from the twelfth century although some more nearly contemporary Irish annals report some events in Northumbria. Numismatic evidence—mints at York continued to produce coins throughout the period—is of considerable importance, although not in the period of Eadwulf's presumed floruit as a new style of coinage appeared in Northumbria between 905 and 927 approximately. These coins bore the name of the city of York and the legend "Saint Peter's money" but no kings are named, so that they are of no help in determining the succession of rulers.