The Sarum Use was founded on customs for the organisation of music and liturgy, as well as management and finance, employed by the bishop, dean and chapter of Salisbury Cathedral until the Reformation, when its liturgical content was rationalised by Cranmer to form the first English Use in the Book of Common Prayer . The origins and development of these customs reach back to the early Middle Ages, to Celtic practices, as well as to the Anglo-Saxon customs of royal Sherborne. Sarum, Old and New, refined the traditions with Norman influence and the result was a Use which became predominant throughout the English Church.