This highly original study examines the history and religious life of the Ottonian Church through its ritual books. With forensic attention to the writing and design of four important manuscripts from the city of Mainz - a musician's troper, a priest's ritual handbook, a bishop's pontifical and a copy of the enigmatic compilation now known as the 'Romano-German Pontifical' - Henry Parkes transforms liturgical sources into eloquent witnesses to the ecclesiastical history of early medieval Germany