The Anglo-Saxon Chronicle is the backbone of Anglo-Saxon history, an almost contemporary record of events for about five hundred years, and a vital resource for Anglo-Saxon historians. This collaborative edition will eventually include the seven base manuscripts with their contemporary continuations, and ancillary material which sheds light on the Chronicle. The nature of the Chronicle, its relation to official historiography, and its historical place, have long been debated: thisproject will provide a uniform edition from which further research can proceed. MS A (CCCC MS 173) is the oldest of the surviving copies of the Chronicle and physically the most complex; it took shape initially during the tenth century and is generally endowed with considerable authority because of its age.