A: Tregaron, Wales, United Kingdom, B: Paris, Île-de-France, France
A quire of ten leaves bound up in a volume of miscellaneous contents preserved in the Bodleian Library, and called St. Dunstan's Classbook (Auct. F. 4. 32 [2176]) represents the earliest surviving manuscript of Book I of Ovid's Ars amatoria (Art of Love). According to a Bodleian Library exhibition catalogue, the last leaf of the manuscript may be in St. Dunstan's hand:
"The original manuscript was probably written in Wales. There are some glosses in Old Welsh, and the 'syntax marks' . . . inserts as a help to construing are also a Welsh feature. This manuscript and the 9th-cent. French copy, Paris lat. 7311, are the oldest manuscripts of the work, and they are closely related" (Hunt, R.W., The Survival of Ancient Literature [1975] no. 117).
Digital facsimile from Digital Bodleian at this link.