Anglo-Saxon Chronicle, MS F (London, British Library,Cotton Domitian A.viii, folios 30-70) is unique in presenting a sustainedly bilingual (Latin and Old English) text. Palaeographicalevidence dates the manuscript to caAD1100; from its scriptit is clear that it was written at Canterbury. It is a witness -in language and script -to the impact of the Norman regime on the ecclesiastical culture of England and particularly its most important church. The evidence which it provides for the history of the Kentish dialect attests at the same time to the breakdown at Canterbury of the late West Saxon literary standard. In view of its importance in various contexts, the publisher and general editors now issue, as a supplementary volume to the collaborative edition, a complete facsimile of this interesting book as a preliminary to a new edition in the series, with an introduction outlining the problems posed by the manuscript.Dr DAVID DUMVILLE is reader in the Early Medieval Historyand Culture of the British Isles, University of Cambridge.