Dot Porter, Curator, Digital Research Services at the University of Pennsylvania Library, offers a video orientation to Penn Library’s Ms. Codex 1629, an early Renaissance commentary on most of the Rhetorica ad Herennium, the earliest comprehensive Latin treatise on rhetoric, attributed to Cicero throughout the Middle Ages. It was written in Italy in 1342 (according to the colophon on f. 34v)
Frequent notes appear in the margins, including the names of the figures of diction in Book 4 (f. 43r-48v). Some leaves are palimpsests, written on parchment previously used for Italian legal documents (some previous text faintly visible perpendicular to the later text, f. 11v, 14r, 28r, 34v, 39r, 51v). One gathering, with text from the end of Book 3 and the beginning of Book 4, is missing between the fourth and last gatherings.
You can read the complete record for this document (and find links to digitized copies) on Franklin. You can also download a copy of this video from ScholarlyCommons, the University of Pennsylvania’s open access institutional repository.