After Oswald's defeat and death at the hands of Penda in 642 Bernicia fell to his brother Oswio, while Oswine son of Osric became king in Deira, though probably subject to Oswio.
Oswine's death was compassed by Oswio in 651, and the throne of Deira was then obtained by 1-Ethelwald son of Oswald.
But Oswio and his son Ecgfrith greatly extended their territories towards the north and north-west, making themselves masters of the kingdoms of Strathclyde and Dalriada, as well as of a large part of the Pictish kingdom.
The Picts and Britons now recovered their independence; for Aldfrith, apparently an illegitimate son of Oswio, who succeeded, made no attempt to reconquer them.
OSWIO (c. 612-670), king of Northumbria, son of .Ã†thelfrith and brother of Oswald, whom he succeeded in Bernicia in 642 after the battle of Maserfeld, was the seventh of the great English kings enumerated by Bede.
Oswio was chiefly responsible for the reconversion of the East Saxons.
In 664 at the synod of Whitby, Oswio accepted the usages of the Roman Church, which led to the departure of Colman and the appointment of Wilfrid as bishop of York.
Oswio died in 670 and was succeeded by his son Ecgfrith.
According to Bede she took the veil in 614, when Oswio was king of Northumbria and Aidan bishop of Lindisfarne, and spent a year in East Anglia, where her sister Hereswith had married ZEthelhere, who was to succeed his brother Anna, the reigning king.
In 655 after the battle of Winwa d Oswio entrusted his daughter IElfled to Hilda, with whom she went to Whitby.
In 654 Anna was slain by Penda of Mercia, and was succeeded by his brother 2Ethelhere, who was killed in 655 at the Winwaed, fighting for the Mercian king against Oswio of Northumbria.
Bernicia was again separate from Deira under Eanfrith, son of lEthelfrith (633-634), after which date the kings of Bernicia were supreme in Northumbria, though for a short time under Oswio Deira had a king of its own.
In the year 653 we find North umbrian influence paramount in Essex, for King Sigeberht at the instance of Oswio became a Christian and received Cedd, the brother of St Chad, in his kingdom as bishop, Tilbury and Ythanceastere (on the Blackwater) being the chief scenes of his work.
The most important of the latter are the column at Bewcastle, Cumberland, believed to commemorate Alhfrith, the son of Oswio, who died about 670, and the cross at Ruthwell, Dumfriesshire, which is probably about a century later.
Osric the nephew of Edwin ruled Deira (6 33634), but his son Oswine was put to death by Oswio in 651.