by Eadwig. Almost all thegns who attested his charters before the division were loyal to him after it. Both Edgar's prominence as an attester of charters up to the division, and his retention as king of Mercia of ealdormen appointed by Eadwig, are evidence of continuity, and that the division of the kingdom was not a coup against Eadwig. Keynes considers both views of the division of the kingdom plausible, commenting that it may have been the result of dissatisfaction with Eadwig's rule north of the Thames, but on the other hand there would have been no presumption at that period that political unity was desirable for its own sake, and it may always have been intended that Eadwig would share the kingship with his brother. Eadwig seems to have retained some seniority. He is described as "King of the English" in his charters, a title which Edgar only occasionally used; Edgar was mostly "King of the Mercians", and rarely also of the Northumbrians and the Britons. All coins, including those issued in Mercia, were in Eadwig's name until his death, and the historian Frederick Biggs comments that if Edgar had seized control of Mercia, it is unlikely that he would have allowed Eadwig to keep control over the area's coinage. Biggs sees the division as a survival of the early Anglo-Saxon tradition of joint kingship. Benedictine reformers such as Æthelwold opposed division because they wanted uniform monastic observance, which would be jeopardised if different kings supported different practices. Æthelwold criticised Eadwig for dividing the kingdom and praised Edgar for bringing it "back to oneness". There is no evidence of rivalry between the brothers, but there were disagreements. Soon after becoming king of Mercia Edgar recalled Dunstan from his exile, and he showed his disapproval of Eadwig's treatment of their grandmother by restoring her property when he acceded to the throne of England in 959. Æthelstan Half-King appears to have retired around the time of the division; he had been Edgar's foster-father and he may have thought it was the right time to hand over his responsibilities. As Ælfhere was a Mercian ealdorman, he served under Edgar when the kingdom was divided even though he had been appointed by Eadwig, and he became Edgar's senior ealdorman. Little is known of Eadwig after the division of the kingdom. A man called Ælfric became an ealdorman in the south-east in 957, but