Introit for Feast of St. Peter of Verona (Peter Martyr, April 29): Protexisti me deus a conventu malignantium alleluia a multitudine operantium iniquitatem alleluia alleluia (Ps. 63). Folio 173r from the original graduale.
- Edition: High quality facsimile by Faksimile Verlag Luzern of the Graduale of St. Katharinenthal Abbey, Diessenhofen in Switzerland, 1312
- Created: 1983
- Collections: Paintings and Prints