Eadric was one of at least eight children and had relatively humble beginnings: his father Ethelric attended the court of King Æthelred the Unready, but was of no great significance and is not known to have had any titles. Even before becoming an ealdorman, Eadric seems to have acted as Æthelred's enforcer; in 1006 he instigated the killing of the Ealdorman of York, Elfhelm. Eadric was married to Æthelred's daughter Eadgyth by 1009, thus becoming his son-in-law. Eadric was appointed Ealdorman of Mercia in 1007.