Oswiu of Northumbria
Osthryth, daughter of Oswiu of Northumbria. The only marriage recorded for Osthryth is that to Æthelred of Mercia, but an earlier marriage to Eanhere would explain why Osric and his brother Oswald are described as Æthelred's "nepotes" — usually translated as nephews or grandsons, but here probably meaning stepsons.