His most famous work was an Occitan poetic book in 34,735 octosyllables called the Breviari d'amor, begun in 1288.
Encyclopedic in length and diversity, its sole purpose is the reconciliation of love for God with the erotic amours of the troubadour lyric.
[3] Matfre also says that he would have written better in Latin (from which he borrowed the word breviari, from breviarium, not found elsewhere in medieval Occitan).
[4] The last section (8,000 lines) of the work, "Perilhos tractatz d'amor de donas, seguon qu'en han tractat li antic trobador en lurs cansos", structured as a dialogue between the defenders Love and her critics, is filled with citations (266 by some counts) of other troubadours and even some trouvères; Matfre cited himself six (Jeanroy) or nine (Paden) times and cited his brother Peire twice.
Matfre had become quite famous by the time Peire de Ladils lumped him together with the heroes of Arthurian romance (c.1340).