Guillaume Durand (nephew)

Pope John XXII and Charles IV of France sent him on an embassy to the Sultan Orhan (1326–1360) at Brusa, to obtain more favourable conditions for the Latins in Syria.

He wrote in 1311, by command of Clement V and in connection with the Council of Vienne, De modo celebrandi concilii et corruptelis in Ecclesia reformandis, in three books.

It is a treatise on the canonical process of summoning and holding general councils, gathered from approved sources with many quotations and illustrations from the Church Fathers and from church history, together with attacks on various abuses and corruptions that were common in the fourteenth century among ecclesiastical persons.

The first edition was printed at Lyons in 1531, then again at Paris by Philip Probus, a canonist of Bourges, in 1545, and dedicated to Pope Paul III as a help towards the Council of Trent.

In 1319, he wrote treatise on the recovery of the Holy Land for King Philip V, entitled Informacio brevis.