John XXII, wishing to organize a Crusade, sent him in 1318 as legate to the Count of Flanders, in the hope of establishing peace between the prince and the King of France.
He was also a member of the commission appointed by John XXII to examine the writings of Petrus Olivi, whose books contained some errors of the Fraticelli.
[1] The Catholic Encyclopedia states that 'About this time he wrote "De causa immediata ecclesiasticæ potestatis" (Paris, 1506) against John of Pouilly, whose errors were condemned 25 July 1321.
The accounts which the patriarch gave of the miserable condition of Palestine led to the announcement of another Crusade, but owing to apathy, and dissensions among the Christian princes, the project failed.
About 1332, he was appointed by the King of France to preside over the deliberations of a body of prelates and theologians whom Philip had convoked at Versailles to discuss the charge made against John XXII, of asserting that the souls of the just will not be admitted to the beatific vision until after the general judgment.