The sources from which Bede draws his material are briefly indicated in the dedication to King Ceolwulf which forms the Preface, and in it he acknowledges his obligations to the friends and correspondents who have helped and encouraged him. For the greater part of Book I (cc. 1-22), which forms the introduction to his real subject, he depends on earlier authors. Here he does not specify his sources, but indicates them generally as _priorum scripta_. These authors are mainly Pliny, Solinus, Orosius, Eutropius, and the British historian Gildas. In the story of Germanus and Lupus he follows closely the Life of Germanus by Constantius of Lyons. Prosper of Aquitaine also supplies him with some materials. When he comes to his main subject, the History of the English Church, he appears to rely but little upon books. Only a very few are referred to here and there, _e.g._, The Life of St. Fursa, The Life of St. Ethelburg, Adamnan's work on the Holy Places, and the Anonymous Life of St. Cuthbert. That some form of annalistic records existed before his time, and that these were consulted by him, we may infer from some of his chronological references (cf. iii, 1, 9). Local information with regard to provinces other than Northumbria he obtains from his correspondents in various parts of England, and these are expressly mentioned in the Preface.
For the history of the Roman mission and of Kent generally, as well as some particulars with regard to the conversion of other provinces, his chief source is the Church of Canterbury, which apparently possessed, besides oral tradition, written documents relating to the first beginnings of the Church. Moreover, Nothelm, who was the bearer of much important material, had been to Rome and had permission to search the papal archives. But it is in dealing with the history of Northumbria, as is natural, that Bede's information is most varied and copious. Much of it is apparently obtained directly from eye-witnesses of the events, much would doubtless be preserved in the records of the Church of Lindisfarne, to which he had access, perhaps also in his own monastery. We know that the monasteries kept calendars in which the death-days of saints and others were entered, and other records of similar nature (cf. iv, 14), and that these were used as materials for history.