Ælla became king after
Osberht (Osbryht) was deposed. The beginning of his reign is traditionally dated to 862 or 863 but evidence about Northumbrian royal chronology is unreliable prior to 867. His reign may have begun as late as 866. Almost nothing is known of Ælla's reign;
Symeon of Durham states that Ælla had seized lands at Billingham, Ileclif, Wigeclif, and Crece, which belonged to the church. While Ælla is described in most sources as a
tyrant and an illegitimate king, one source states that he was Osberht's brother. The
Great Heathen Army, composed mostly of Danish, Norwegian and Frisian Vikings, landed in Northumbria in mid-866 and had captured
York by 21 November. Subsequent events are described by historians such as
Symeon of Durham,
Asser and
Æthelweard in accounts that vary only in detail. According to the
Historia Regum Anglorum, following the invasion of the Danes, the previous "dissension" between Osberht and Ælla "was allayed by divine counsel" and other Northumbrian nobles. Osberht and Ælla "having united their forces and formed an army, came to the city of York" on 21 March 867. A majority of the "shipmen" (Vikings) gave the impression of fleeing from the approaching Northumbrians. "The Christians, perceiving their flight and terror", attacked, but found that the Vikings "were the stronger party". Surrounded, the Northumbrians "fought upon each side with much ferocity" until both Osberht and Ælla were killed. The surviving Northumbrians "made peace with the Danes". The
Anglo-Saxon Chronicle does not name the Viking leaders, but it does state that "Hingwar and Hubba" (probably
Ivar and
Ubba) later killed King
Edmund of East Anglia. Ubba was also named as a leader of the army in Northumbria by
Abbo of Fleury and by the
Historia de Sancto Cuthberto. Symeon of Durham lists the leaders of the Viking army as "
Halfdene [Halfdann], Inguar [Ingvar], Hubba, Beicsecg, Guthrun, Oscytell [Ketill], Amund, Sidroc and another duke of the same name, Osbern, Frana and Harold." ==Family==