At first blush Harvard's Houghton Library ms Lat 132 is a somewhat unremarkable Use of Rome Hours from Bruges. Though it has 12 lovely miniatures in the style of the "Gold Scrolls group", the calendar is rather boring, red and black with red strikethroughs for medium-importance days like vigils. It was updated at least 2 seperate times, with a second hand writing in black Gothic similar to the original and a third hand in a later batarde . Hidden in it, however, is an interesting clue to the literacy of its owners, October 9th(see f.Fv below). Written in red, this is the Feast of St. Denis, patron of the eponymous cathedral just north of Paris and the martyr for whom Montmartre is named. Denis is a adaptation of his actual Greek/Latin name, Dionysus. The first scribe wrote Dyonisi Epi (Dionysus Bishop), as expected for a calendar in Latin, but the second scribe appended "S. Denis", either not understanding that they are the same, or for a patron who might not know the Latin.
(Link to the DB: 135)