I SHOULD like to record my gratitude and indebtedness to Professor
C. N. L. Brooke, who very kindly read the text in manuscript and made many
helpful suggestions. This volume also owes a great deal to the knowledge and
advice of Mrs A. M. Erskine, who most generously guided me through the
voluminous records of Exeter cathedral library, which she has recently classified, and suggested profitable sources to investigate.