followed, and declared in a proclamation of 1020 that everyone should "steadfastly observe the law of Edgar." ASC D states that in 1018 the Danes and the English reached an agreement "according to Edgar's law". In a letter from Cnut to his subjects in 1019/20 he referred to a law code agreed at Oxford, which he described as Edgar's law, and urged people to keep to it. In Wormald's view, Cnut considered that his regime was based on the Oxford agreement to keep to Edgar's law. However, the code bears little resemblance to Edgar's legislation, and the reference to him was probably symbolic as a revered lawmaker, rather than practical as a source. Edgar's legislation continued to be held in high regard after the Norman Conquest, and the twelfth-century historian Eadmer referred to the "holy laws" of "the most glorious king Edgar", although there is no evidence that he knew the codes. Coinage The only coin in common use in late Anglo-Saxon England was the silver penny, but a small number of halfpennies were also produced and nine are known for Edgar. A penny was worth around half of what it had been a hundred years earlier. Edgar's coinage is divided into two phases, pre-reform which broadly carried on the diverse coinage design of his immediate predecessors, and the major reform near the end of his reign. There had been an increase in regional variation in coinage in the reigns of Edmund and Eadred, especially in Northumbria, which switched back and forth between English and Viking control, and the permanent restoration of control over the north after 954 allowed a gradual return to the greater unity of Æthelstan's coinage. Edgar's pre-reform coin designs included Horizontal types, which continued from Eadwig's reign. The Circumscription Cross type was introduced under Æthelstan and was rare for the next twenty years, before becoming common under Edgar. The Bust Crowned type (see image) also became much more common in Edgar's reign. Edgar's early coinage is described by Naismith as "an important step towards the fundamental change" of the reformed coinage. Æthelstan's reign and Edgar's pre-reform coinage are the only pre-reform periods when the mint place was commonly shown, and even in these periods many coins did not show the information. Thirty mint-places are named on Edgar's pre-reform coins, and another six are inferred by numismatists for coins which do not show the town. There was