EDRIC, or EADRIC, STREONA (d. 1017)  , ealdorman of the Mercians, was a man of ignoble birth who was advanced to high dignity through the favour of the English king rEthelred II . In 1007 he became ealdorman of the Mercians, and subsequently married'Ethelred's daughter Eadgyth . In the struggle between the English and the Danes he appears in the character of an arch-traitor . When 'Ethelred in Too9 proposed a great attack on the Danes, Edric dissuaded him from carrying it into effect . Again, on the invasion of England by Canute in 1015 Edric deserted Edmund Ironside and joined him . After the battle of Otford he returned to Edmund, but only by his treachery at the battle of Assandun to secure the utter defeat of the national cause . When peace was at length made, Canute restored to Edric the earldom of Mercia; but at Christmas 1017, fearing further treachery, he had him slain—" very rightly " says the Saxon Chronicle .