The focal point of this thesis is my complete transcription of the thirteenth-century Coventry Pontifical manuscript (Cambridge, University Library, Ff. VI. 9). In order to contextualise the Coventry Pontifical manuscript, this thesis comprises two investigative strands. The first is an exploration of the significance of the manuscript in the lives of its medieval users; the interactions between the manuscript and its culture; and the interplay between the manuscript and its users. To further our understanding of the significance of the Coventry Pontifical to its users, this thesis surveys the liturgical practices included in the manuscript, and how these practices and the production of the manuscript required the skills and money of the general population as well as the monastic community. An examination of routines of the time and an overview of the politics and people connected to the Diocese of Coventry and Lichfield follows. Contemplating the people who used the manuscript and how they used it leads to appreciation of the manuscript, and my transcription of it, beyond the significance to the user. It increases awareness of how and why the manuscript was compiled. The second strand uses the Coventry manuscript as a focus for a broader exploration of textual and musical liturgical transmission patterns of insular pontifical manuscripts in the twelfth and thirteenth centuries. Tracing these patterns of transmission, using a combination of variant categorisation and statistical analysis, reveals any relationships which exist between manuscripts produced across medieval Britain. The analysis, combined with consideration of the nature of pontifical exemplars, allows me to explore how pontifical transmission differs from that of other types of liturgical manuscript. This investigation of transmission patterns pinpoints the relative position of the Coventry manuscript in its insular liturgical setting, and thus emphasises the significance of my complete transcription of the manuscript to current scholarship.