CCCC MS 17 is a twelfth-century volume of texts by Augustine of Hippo, and one sermon which is attributed to John Chrysostom in this manuscript, but which was sometimes claimed for Augustine in the Middle Ages. This sermon was included in Alain of Farfa's eighth-century Homiliary (Winter, item 92), and therefore circulated widely in the Middle Ages. MS 17 is not used for published editions of any of the texts it contains. M. R. James suggested it might be from Norwich cathedral priory, presumably because of the classmark it contains, but Neil Ker found no reason to sustain this attribution.