Manuscripts can be studied, first, and most obviously, as objects of material culture. Such study may provide valuable information concerning the parchment, the arrangement of quires, the type of script, the letter forms, the decoration, and so on. Manuscripts can also be studied as witnesses to the intellectual preoccupations of the scholars who compiled and copied them: such preoccupations are most apparent in the selection and glossing of the texts which manuscripts from various periods transmit. There is yet a third class of information to be gleaned, from some manuscripts at least, by a combined study of both their physical appearance and of the texts they contain: this information pertains to the time when, the place where, and the reasons why a collection of texts (which is preserved only in a later book) was first put together. Cambridge, Corpus Christi College 57 is a manuscript which invites such an approach. The book, its physical appearance (including its numerous later additions), the texts it presents, and the way it was used in late Anglo-Saxon England have been thoroughly and competently studied, and such studies are invaluable for what I shall attempt to do here: to uncover the ambience in which the ultimate exemplar of Corpus 57 was compiled and used, and to uncover the reason why this exemplar was copied into Corpus 57 and why it was copied in the fashion in which it appears there.