Of all the services held in a saint's honour in the course of his or her feast-day, mass was the most important: and central to the mass were the prayers invoking the saint's intercession said by the celebrant. Together with the canon, these ‘proper’ prayers – by the ninth century normally a collect (collecta), secret (super oblata or secreta), preface (prefatio) and postcommunion (ad complendum or postcommunio) – formed the backbone around which chant and readings were arranged, and they were gathered together in the sacramentary, the book used by the celebrant alone. Further forms might be provided as ‘alternatives’ (aliae orationes); for the conclusion of mass (super populum); and occasionally, for vespers of the day before the feast and of the feast itself (ad vesperas), but generally speaking, these are rare. As ‘informal’ cults became formal, or prize relics came to hand, so the need for new suites of prayers arose. These could be composed afresh, ‘borrowed’ from existing saints' masses (an easy option, necessitating little more than the insertion of the new saint's name in the relevant prayers); or if the precentor's creative powers failed him completely, they could be taken from the ‘commons’, that is, from the series of ready-made masses contained in almost every medieval sacramentary or missal for a ‘confessor’, a ‘martyr’ or a ‘virgin’, and so on. Some houses attracted the services of gifted writers; other seem not to have been so fortunate. It is my intention to analyse here the genesis and dissemination of a mass from a house of the former class which throws interesting light on the liturgical links between England and the Continent in the eighth century.