Gildas is the earliest insular writer who has left us a substantial legacy of theological writing. He is usually, however, not seen as a theological writer but as an historical source for ‘dark age’ Britain at the time of the Germanic invasions in the mid-sixth century. Yet the deacon Gildas saw himself as a prophet charged by God to call the rulers and clergy of his society back to being a chosen people of the covenant. The form this call took was that of an indictment of those groups based on the testimonia of the Christian scriptures. This book is a study both of Gildas’s use of the scriptures (his text, his canon, his exegetical strategies) and of how, from the way he interprets sacred history, he created a distinctive theology of the church and of salvation.