At the Morgan Library and Museum is a Preparatio ad missam manuscript (MS H. 6) with a full-page frontispiece depicting Pope Leo X:
This frontispiece faces the start of the text with a heading in gold against a blue background, a full border, and historiated initials:
This is relevant for our purposes because the Morgan manuscript must have been en suite with that from which the Vassar-Wildenstein-Wildenstein-Antiquus cuttings come, as details of a few of its initials clearly show:
We see the same priest and the same leaded window, although instead of the red embroidered wall-hanging (see below) we seem to have a green painted walls decorated with the triple-feather device of Leo X. The initials in the Morgan manuscript show various stages in a priest's preparation for mass, while the Vassar, Wildenstein, and Antiquus cuttings show the performance of mass:
It is possible to deduce a certain amount about the appearance of the cuttings' parent volume, and this will be the subject of a future post.