The codex contains motets, Mass movements, and a handful of virelais, chaces, and ballades, composed in the middle of the 14th century.
It was long thought to have been compiled in Avignon, the seat of the French Papacy, around 1370.
[4] Most recently, however, Karl Kügle has asserted that the source was made in Ivrea itself, by musicians connected to the Savoyard court (possibly Jehan Pellicier), in the 1380s or 1390s.
All of the music in the codex is anonymous, but attributions have been made on the basis of concordances to Philippe de Vitry, Guillaume de Machaut, Magister Heinricus, Bararipton, Depansis, Matheus de Sancto Johanne, Orles, Sortes, and Loys.
Kügle notes that ars subtilior-style compositions are absent from the source;[6] however, sources without ars subtilior compositions far outnumber those containing these pieces, so it is hard to read particular significance into this statement.