Following the French victory at the battle of Cassel on 23 August 1328, which ended the peasant revolt in Flanders, Jean was charged with securing conditions of peace.
Philip VI empowered him to demolish the fortifications of Ypres, Courtrai and certain other cities, and to lift the sentence of excommunication imposed on the citizens of Bruges.
The abbot granted Jean the right to hunt in the woods of Néron, near Champeaux, for three years.
There, in a public consistory on 26 July 1333, Jean swore an oath that either Philip or his son John would lead a new crusade.
[1] Impressed by Jean's intelligence and abilities, Pope John XXII appointed him to the metropolitan see of Reims in October 1334.
[4] During his long absence, the cathedral chapter of Reims sent him a letter demanding he perform the canonical visitation of his diocese.
Jean instead obtained a papal dispensation and sent Guillaume Bertrand, the bishop of Noyon and one of his suffragans to perform the duty in his place.
Matins was no longer said daily at midnight, and only one mass was performed each day before the grand altar of the cathedral.
As of 1340, on certain days of the year, the canons still ate together at a communal table, an ancient practice that cannot be traced later than this date at Reims.
Attended by six bishops, it published seventeen canons aimed at protecting the privileges and liberties of the church from the effects of war.
The provost, Étienne de Courtenai, called a meeting of the canons in order to once again summon Jean to his diocese, threatening otherwise to excommunicate recalcitrant officials.
On 24 September at Reims, he consecrated the Philip's son John as king and his wife, Joan, as queen.