The liturgical evidence for bishops remains underexplored. What work there is tends to focus on those rites reserved to the bishop collected in pontificals and therefore ignores the potential of more mundane books in daily use. This case study of a sacramentary used by the bishop of Noyon in the late tenth and early eleventh centuries reveals, through a comparison with similar materials produced for contemporary communities within northern France, the ways in which the bishop's roles in the secular world were reflected in minor changes made to the liturgy in use in one of his churches. It thus casts fresh light on the less well-known see of Noyon, and at the same time demonstrates the importance of incorporating such mundane materials into modern studies of episcopacy in this period.Recent work on the early and central medieval episcopate has greatly improved our understanding of how bishops, and the clerical communities in which they participated, understood, constructed and reconstructed their own roles in this period. 1 It is striking, however, that almost all of this scholarship focuses either on the political and secular aspects of episcopal lordship, through the study of charters, vitae and other narrative writings, or upon the evidence of letters, sermons, church councils and church law for the development of episcopal office. What has been largely neglected from these studies are those texts produced to support the main business of episcopal communities, that of prayer. Similar criticisms have been made of research into monastic communities; as the musicologist Susan Boynton has observed, the 'privileging of property and politics' risks marginalising liturgical evidence. 21 The research for this paper was conducted with the support of funding for the 2016-19 project Humanities in the European Research Area: After Empire: Using and not using the past in the crisis of the Carolingian world, c. 900-c.1050 (HERA.15.076). I should like to thank Steven Vanderputten and especially Brigitte Meijns for her help as editor, and the reviewer for their constructive comments.