Oswiu of Northumbria - Overlord of Britain

Overlord of Britain

The surprising defeat of the hitherto dominant Penda, and the death of the East Anglian king Æthelhere left Oswiu as the dominant figure in Britain. Œthelwald's ambivalent stance during the campaign which led to the Winwæd appears to have led to his removal as he disappears from the record at this time. Oswiu installed his adult son Eahlfrith as king of Deirans in Œthelwald's place. Penda's son Peada was installed as king of southern Mercia, while Oswiu took the north of the kingdom. Other subject rulers seem to have been established elsewhere in Mercia.

Further south, Æthelhere's brother Æthelwold may have been established with Oswiu's assistance, as well as that of his kinsman by marriage King Eorcenberht of Kent. Cenwalh of Wessex, who had been driven out of his lands by Penda for putting aside his marriage to Penda's sister, may also have returned to power in this period, again with Oswiu's assistance. King Sigeberht the Good of the East Saxons was Oswiu's ally. Oswiu's nephew, Eanfrith's son Talorcan, may have also been established as a leading king among the Picts at this time.

Oswiu's total domination lasted only a short time, around three years. The proximate cause was the death of Peada, supposedly poisoned by his wife, Oswiu's daughter Eahlflæd. This probably occurred at Easter 656, and Oswiu proceeded to install governors or subject kings in Mercia. Probably in late 659, but perhaps in 657, a revolt led by three Mercian noblemen—Immin, Eata, and Eadberht—installed Penda's son Wulfhere as ruler of the Mercians and drove out Oswiu's supporters. Oswiu remained a force to be reckoned with, and political settlement rather than open warfare appears to have resolved the crisis. Oswiu's kinsman Trumhere was named to be Wulfhere's bishop. While Wulfhere extended Mercian influence and authority in southern Britain, he apparently continued to recognise Oswiu's primacy.

Welsh sources suggest that Oswiu campaigned in Wales in the late 650s, imposing tribute on the Welsh kings who had previously been Penda's allies such as Cadafael, the battle-dodging King of Gwynedd. Elsewhere in the south, Oswiu's ally Sigeberht of the East Saxons was murdered and replaced by his brother Swithhelm, who remained a Christian, but distanced himself from Oswiu and the Irish-Northumbrian church. Switthelm was probably subject to the East Angles.