Almost at once, therefore, the vague reports which had been floating about began to attain a certain definiteness: there were allusions made, though no name was mentioned, to a young girl in Loudun; who in spite of Grandier's frequent unfaithfulness yet remained his mistress-in-chief; then it began to be whispered that the young girl, having had conscientious scruples about her love for Urbain, he had allayed them by an act of sacrilege--that is to say, he had, as priest, in the middle of the night, performed the service of marriage between himself and his mistress.

The more absurd the reports, the more credence did they gain, and it was not long till everyone in Loudun believed them true, although no one was able to name the mysterious heroine of the tale who had had the courage to contract a marriage with a priest; and considering how small Loudun was, this was most extraordinary.
Resolute and full of courage as was Grandier, at length he could not conceal from himself that his path lay over quicksands: he felt that slander was secretly closing him round, and that as soon as he was well entangled in her shiny folds, she would reveal herself by raising her abhorred head, and that then a mortal combat between them would begin.
But it was one of his convictions that to draw back was to acknowledge one's guilt; besides, as far as he was concerned, it was probably too late for him to retrace his steps.

He therefore went on his way, as unyielding, as scornful, and as haughty as ever.
Among those who were supposed to be most active in spreading the slanders relative to Urbain was a man called Duthibaut, a person of importance in the province, who was supposed by the townspeople to hold very advanced views, and who was a "Sir Oracle" to whom the commonplace and vulgar turned for enlightenment.

Some of this man's strictures on Grandier were reported to the latter, especially some calumnies to which Duthibaut had given vent at the Marquis de Bellay's; and one day, Grandier, arrayed in priestly garments, was about to enter the church of Sainte-Croix to assist in the service, he encountered Duthibaut at the entrance, and with his usual haughty disdain accused him of slander.
Duthibaut, who had got into the habit of saying and doing whatever came into his head without fear of being called to account, partly because of his wealth and partly because of the influence he had gained over the narrow-minded, who are so numerous in a small provincial town, and who regarded him as being much above them, was so furious at this public reprimand, that he raised his cane and struck Urbain.
The opportunity which this affront afforded Grandier of being revenged on all his enemies was too precious to be neglected, but, convinced, with too much reason, that he would never obtain justice from the local authorities, although the respect due to the Church had been infringed, in his person he decided to appeal to King Louis XIII, who deigned to receive him, and deciding that the insult offered to a priest robed in the sacred vestments should be expiated, sent the cause to the high court of Parliament, with instructions that the case against Duthibaut should be tried and decided there.
Hereupon Urbain's enemies saw they had no time to lose, and took advantage of his absence to make counter accusations against him.
Two worthies beings, named Cherbonneau and Bugrau, agreed to become informers, and were brought before the ecclesiastical magistrate at Poitiers.

They accused Grandier of having corrupted women and girls, of indulging in blasphemy and profanity, of neglecting to read his breviary daily, and of turning God's sanctuary into a place of debauchery and prostitution.