He was among the theologians consulted by Pope John XXII in 1322 during the formulation of the bull Cum inter nonnullos (1323), which condemned the Franciscan doctrine of the absolute poverty of Christ.
He served as the executor of the testaments of Bartholomew of Capua (1328), Bernard of Lautrec (1335) and Riccardo Scillato (1341).
In 1348, he accompanied her to Avignon, where she swore fealty to the pope and received a dispensation to marry Louis of Taranto.
[1] When the Dominican general chapter held in Marseille in 1316 asked that the errors of Durand of Saint-Pourçain be rectified, John collaborated with Peter of La Palu in drawing up a list of 235 deviations from Thomas Aquinas found in Durand's writings.
[4] In philosophy, John belongs to the speculative tradition of Godfrey of Fontaines and James of Metz.