When Jean-Louis took up religious orders is not known. He was, however, appointed prior of Belle Fontaine, a benefice of Saint-Barthelemy at Noyon, in the diocese of Beauvais (Oise), then, in accord with Augustinian practice, prior of Saint-Nicolas at La Ferté-sous-Jouarre, a benefice of Saint-Jean des Vignes at Soissons (Aisne). He was engaged in a lawsuit in 1691 with Paul de Lusignan, bishop of Rodez, abbot of Saint-Barthelemy at Noyon, as to the rights of Belle Fontaine, a case judged in his favour. Bossuet’s brother Antoine, one might note, was intendant de la généralité de Soissons and was a major creditor of Gerauld de Cordemoy when he died. Antoine’s address was given as rue des Fossés-Saint-Jacques, where the Perrault brothers lived, hard against the abbaye de Sainte-Geneviève, in Paris.