Seems to have been joint ruler at York with Eowils after Aethelwald had been killed c.903. His ancestry has not been established. For 909, the Anglo-Saxon Chronicle reported that Edward the Elder, king of Wessex, had raided and devastated Northumbria, presumably in retaliation for Danish incursions. Halfdan and Eowils led a counter-raid the following year but, on the way back, loaded with spoils, were intercepted at Tettenhall, near Bridgnorth, on 5 August 910 and killed. The defeat was a severe blow to Viking York's power.
Subjects: British History.