EDRIC (or EADRIC), STREONA (d. 1O17), ealdorman of the Mercians, was a man of ignoble birth who was advanced to high dignity through the favour of the English king Aethelred II. In 1007 he became ealdorman of the Mercians, and in 1009 mar ried Aethelred's daughter Eadgyth. In the struggle between the English and the Danes he appears in the character of an arch traitor. When Aethelred in 5009 proposed a great attack on the Danes, Edric dissuaded him from carrying it into effect. At the "witan" held in Oxford in 1015 Edric had Sigeferth and Morkere slain by treachery. In the same year Canute invaded England ; Edric, who had joined Edmund Ironside, subsequently quarrelled with him and went over to Canute. After the battle of Oxford he returned to Edmund, but only to secure the utter defeat of the national cause by his treachery at the battle of Assandun. After Edmund's death Canute restored to Edric the earldom of Mercia; but in 1017, fearing further treachery, he had him slain.