Pierre Maurice, Mauricii, received first rank among the candidates for the theological license in January, 1429, and the first rank among those taking the master's degree on May 23 of the same year.

On January II, 1430, by letters of Henry VI, he was named to a canonicate in the church of Rouen which an Englishman named Heton resigned in his favor. This notorious young theologian was already strongly tied to the English government, since he had obtained from Henry VI the benefice of Saint Sebastien de Préaux, in the diocese of Lisieux.

He was curé of Yerville, and exchanged that benefice for that of the chapel of Saint Pierre in the cathedral of Rouen; he was curé of Paluel, and also chaplain of the chapel of Saint Mathurin at the cathedral. On June 5, 1430, he was designated by the canons to speak in their name at the ceremonies attending the entrance of Henry VI into the cathedral.

He was elected to plead with the Cardinal of England [Winchester] in their name on behalf of Louis de Luxembourg's candidacy for the vacant archbishopric of Rouen (December 3).

He was delegated in 1431 to accompany Pasquier de Vaux, ambassador of the English king to Rome, and he went to Bile in 1434 as ambassador of Henry VI, and the following year he went to England at the order of the Council.

Named vicar-general on December 5, 1436, he died shortly afterwards.

The thirty-two precious manuscripts that he owned were willed to the library of the Chapter of Rouen; among them were a Terence, a Virgil, a Vegetius, and a beautiful breviary which Louis de Luxembourg bought.

This educated theologian was very active in the Trial and he displayed a zeal in trying to enlighten Jeanne which does not seem to have been very sincere.