Previously believed destroyed by fire in 1944, but rediscovered badly charred in 1989 (Pozzobon1989; details of restoration and further discussion in BryPozz). Contents known from thematic catalogue made by chapter archivist Giovanni d'Alessi.
175 motets: 1-79 in liturgical sequence (Christmas to Christmas), 80-99 in a further sequence Christmas to the feast of St Benedict (21 March) supplementing the first; then 100-127 for the common of saints, apostles etc; five motets in liturgical sequence 128-132; and the second series II: 1-43 entirely of Marian motets.
60 of the 175 motets (none from the second series) are contrafacta, in many cases adapted musically as well as re-texted with locally-specific texts, probably by Pietro Varisco, a priest at Treviso Cathedral, and the compiler and owner of the manuscript (BlackTrev).
Copied in Treviso by a single scribe, identified as Giovanni Ferrandino (BryPozz). Perhaps for use by cathedral choir or one of the city confraternities (BlackTrev); BryPozz argue that it was prepared for the Scuola di Santa Maria dei Battuti (a flagellant sect in Treviso); GlixonMDC that it was for Varisco's singers who serviced many churches in the city.