French composer of whom nothing is known but his name and his one ballade in the Chantilly MS, En nul estat,. The identification of the composer of this fiercely complex work with Petrus, who was connected with the papal chapel under Clement VII and Benedict XIII, is not absolutely certain, but it is certainly plausible. This work, setting a philosophical text dealing wth deceit, treachery, and the shortness of life, is his only known work.