King Osbryht and Alla, having united their forces and formed an army, came to the city of York; on their approach the multitude of the shipmen immediately took flight.

A rare cluster of high status Anglian gravestones from that era, one bearing his name, were discovered in Victorian times in the graveyard of the ancient church of St Michael and All Angels, where they are on public display.

[9] Ragnarssona þáttr (The Tale of Ragnar's sons) adds a great deal of colour to accounts of the Viking conquest of York.

This associates the semi-legendary king of Sweden Ragnar Lodbrok and his sons, Hvitserk, Björn Ironside, Sigurd Snake-in-the-Eye, Ivar the Boneless, and Ubbe.

[10] Earlier English sources record that Ælla and Osberht died in battle, the Anglo-Saxon Chronicle stating that "both the kings were slain on the spot".

[11] The main figure in the revenge tales is Ivar, who is sometimes associated with the Viking leader Ímar, brother of Amlaíb Conung, found in the Irish annals.

Symeon of Durham lists the leaders of the Viking army as "Halfdene, Inguar, Hubba, Beicsecg, Guthrun, Oscytell, Amund, Sidroc and another duke of the same name, Osbern, Frana, and Harold.