Admont, Stiftsbibliothek, Cod. 40
From Clavis Canonum
Admont, Stiftsbibliothek, Cod. 40 (saec. XI according to Wichner, p. 55) is a codex of 182 folios containing letters of Gregory the Great. Fol. 182r-v also contains a Versus de Gregorio and two late medieval papal letters.
For a summary description and digital images, see https://manuscripta.at/hs_detail.php?ID=25941