Áedán's army included the Bernician exile Hering, son of the former Bernician king Hussa; his participation is mentioned by the Anglo-Saxon Chronicle (manuscript E, year 603), and may indicate dynastic rivalry among the Bernicians.
Bernicia was then briefly ruled by Eanfrith, son of Aethelfrith, but after about a year he went to Cadwallon to sue for peace and was killed.
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A few important Anglian centres in Bernicia bear names of British origin or are known by British names elsewhere: Bamburgh is called Din Guaire in the Historia Brittonum; Dunbar (where Saint Wilfrid was once imprisoned) represents Dinbaer; and the name of Coldingham is given by Bede as Coludi urbs ("town of Colud"), where Colud seems to represent the British form, possibly for the hill-fort of St Abb's Head.
Northumbria was then split back into its separate predecessor kingdoms of Bernicia and Deira, and Cadwallon defeated and killed their new kings, Eanfrith of Bernicia and Osric of Deira, as well.
Copsi's rule lasted a mere five weeks, at which time he was murdered by Osulf, son of Eadulf III of the ancient Bernician family —which had historically governed the area from Bamburgh, at Newburn-upon-Tyne.
Proceeding to discuss the role of the Vanir in Norse mythology, he deals with Ingvi-Freyr of Uppsala in Sweden and then Ingui of Bernicia in Northern England, ultimately concluding that in early Anglo-Saxon history, a deity named Ingui was believed to be the progenitor of Anglian kings.
It is not entirely certain whether Hussa was the son of Ida, founder of the kingdom of Bernicia, or rather the leader of a rival Anglian faction.
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At some point during his reign, the coalition forces of Rheged and the Brythonic kingdoms of Strathclyde, Bernicia and Elmet laid siege to Hussa and was almost successful in driving the Anglian Bernician kings out of Britain.