Oswiu of Northumbria
By a complex chain of reasoning, one can deduce that Eanhere married Osthryth, daughter of Oswiu of Northumbria, and had sons by her named Osric, Oswald and Oshere. Osthryth is recorded as the wife of Æthelred of Mercia. An earlier marriage to Eanhere would explain why Osric and Oswald are described as Æthelred's "nepotes" — usually meaning "nephews" or "grandsons" but here probably "stepsons".