Bamberg, Staatsbibliothek, Msc.Patr.69
From Clavis Canonum
Bamberg, Staatsbibliothek, Msc.Patr.69 (olim B.IV.10) was written at Mainz in the eleventh century (saec. XI 2/4 or saex 2/2 according to Hoffmann, who assumed one of the scribes was trained at Lorsch). It contains on fol. 1v-198v Gregory's Homiliae in Ezechielem and on fol. 199-247v the first 112 letters of the so-called Collectio CC epistolarum of his letters (all from the ninth book of the register).
For a detailed description (Kautz) and digital images, see https://bibliotheca-laureshamensis-digital.de/view/sbbam_mscpatr69