Arthur Westwell is a research assistant in the Faculty for Catholic Theology at the Universität Regensburg. His individual research project, in which he investigates Carolingian liturgical manuscripts, is supported by the Deutsche Forschungsgemeinschaft. He has held fellowships at the Pontifical Institute for Medieaeval Studies in Toronto, funded by the Mellon Foundation, and at the Universität Trier, with the Humboldt Stiftung.

• Introduction; 1. The 'Roman' Collection of Ordines in Metz, Lorsch and Tours; 2. The 'Frankish' Collection in Verona, Regensburg, Nonantola and Corbie; 3. Unique Collections of the Ordines from Worms and Wissembourg, St Amand and St Gallen; 4. Liturgical 'Usefulness' and Reading the ordines romani; 5. Orders for the Stational Mass in Frankish Cities and Monasteries; 6. The Ordo Romanus of the Baptismal Scrutinies; 7. Ordines for Special Occasions, Ordination and the Ember Days: The Contribution of Arn of Salzburg; 8. Layout, Script and Language of the Ordo Romanus Manuscripts; Conclusion.

'This book is an excellent example of revisionist research … in which the serious study of the manuscripts leads to conclusions different from those of the scholarly pioneers of an earlier period. Up until this point, the five-volume series of Andrieu was the only reference point for the study of the ordines romani. With Westwell's contribution, we can now re-evaluate some of Andrieu's conclusions and read the ordines in a new light.' Cassian Folsom, Ex Fonte – Journal of Ecumenical Studies in Liturgy