Collet was born at Belley, in the department of Aine, of worthy and pious parents. He entered the army after having gone through a course of studies, and became sub-lieutenant in 1796, and was at the siege of Brescia. But, disgusted with military service, he deserted and went to Rome. Whilst there he heard of the wreck of a merchant vessel off Civita Vecchia under a young captain named Tolosant, of Lyons, with the loss of all hands. At once he saw his chance. He forged papers, got a ring cut with the Tolosant arms, and passed himself off as the captain, who had escaped. By this means he deceived a worthy priest, who was steward to Cardinal Fesch; and as the Cardinal was acquainted with the family of Tolosant, he introduced the _soi-disant_ captain to him. The Cardinal at once insisted on Collet taking up his abode with him, and he even presented him to the Pope, who gave the rascal his apostolic benediction. As a friend of Cardinal Fesch, Napoleon’s kinsman, and an inmate of his house, Collet made the round of the bankers of Rome, discussed with them schemes for making money, and drew loans from them to the amount of 60,000 francs. Then Collet was invested with a charge to perform some ecclesiastical commissions in Lombardy. He left—disappeared—just as suspicions began to be entertained that he was not what he pretended to be, and turned up at Mondovi. There he gave himself out to be a gentleman of means, and he speedily ingratiated himself into the society of the young bloods there. As Mondovi was a dull town, he proposed to brisk it up by the institution of a theatre and by amateur performances. This proposition was cordially accepted, a committee was appointed, and Collet was named costumier; he was to purchase a complete theatrical wardrobe. All who were to act were required to pay for their own costumes, and the money was put into Collet’s hands to furnish these. All at once the costumier vanished, carrying off with him all the dresses, those of clergy, bishops, generals, civic authorities, with ribbons and crosses of various orders. He next turned up at Sion, in the Vallais, now in the cassock of a priest, and furnished with fictitious letters of Orders. There he presented himself to the bishop, and so ingratiated himself into his favour that the bishop nominated him to one of his best cures, which happened to fall vacant. He was instituted, and for five months said mass, preached, married, baptized, catechised the children, and consoled the dying.