The Regula S. Benedicti was known and used in early Anglo-Saxon England, but it was not until the mid-tenth-century Benedictine reform that the RSB became established as the supreme and exclusive rule governing the monasteries of England. The tenth-century monastic reform movement, undertaken by Dunstan, Æthelwold and Oswald during the reign of Edgar (959–75), sought to revitalize monasticism in England which, according to the standards of these reformers, had ceased to exist during the ninth century. They took as a basis for restoring monastic life the RSB, which was regarded by them as the main embodiment of the essential principles of western monasticism, and in this capacity it was established as the primary document governing English monastic life. By elevating the status of the RSB as the central text of monastic practice in England and the basis of a uniform way of life the reformers raised for themselves the problem of ensuring that the RSB would be understood in detail by all monks, nuns and novices, whatever their background. Evidence of various attempts to make the text accessible, both at the linguistic level and at the level of substance, survives in manuscripts dating from the mid-tenth and eleventh centuries; the most important of these attempts is a vernacular translation of the RSB.