Preface
The articles and lectures in this volume are reprinted as they first appeared, apart from a few retrospective comments and bibliographical references introduce here and there in square brackets, and an added note at the end of chapters where that seemed called for.

Part of the Roman inheritance of the Britons, later the Welsh, together with Christianity and the use of letters, was the form of an artifact which had been adopted by the Christianized Romans for the preservation of literature: the codex.