Louvois endeavoured to bring La Reynie over to his views, to persuade him, at first gently, that it was important that the examining judge should find Madame de Montespan innocent. Louvois spoke, urged, demonstrated: La Reynie listened, but did not heed. The minister then changed his tone. He sought to prove to the magistrate that Madame de Montespan must really be innocent. He went to Paris on February 15, 1681, to explain the matter to him. Had not Mademoiselle Desœillets, the favourite’s maid, written that ‘she was not guilty, and that what he (La Reynie) had been told about her dealings with La Voisin could not be true; that there were twenty women about Madame de Montespan, of whom eighteen hated her, and that they might be asked for information about her, but she thought that the Countess de Soissons had two maids, one of whom was almost her own height, and that the countess might well have taken her name (the name of Mademoiselle Desœillets), to injure both her and Madame de Montespan, whom she hated.’

La Reynie replied that all that was wanted was to confront the young lady with the prisoners at Vincennes. We have already shown that the confrontation took place and that Mademoiselle Desœillets was recognised. Louvois had perforce to devise another defence, to which the inflexible La Reynie made answer: ‘After reflecting on what Mademoiselle Desœillets said to Monsieur de Louvois at Vincennes, about her having a niece who was very often with the sorceresses, and who might easily have been mistaken for her, I think it doubtful, because she only said so after having been recognised by the prisoners, and because Madame de Villedieu her good friend, who is at Vincennes, and had had warnings, tried to mislead us in the same way; it appears a concerted plan; and when I asked her what Mademoiselle Desœillets was like, she told me that she was small, short, and well-developed, which is a false description and exactly fits the niece.’

When it was pointed out to La Reynie that La Voisin had denied all knowledge of Mademoiselle Desœillets, he replied: ‘The denial of La Voisin, persisted in till her death, must be the more suspicious in that it was so obstinately kept up, because it is now proved that they had dealings together. If Mademoiselle Desœillets herself denies these dealings, that itself can only increase the suspicion.’

Louvois dwelt also on a retractation made by La Filastre after her conversation with her confessor at the moment of going to execution; but the lieutenant of police replied: ‘The declaration made by La Filastre exonerating Madame de Montespan applies solely to the poisoning of Mademoiselle de Fontanges. There are two other facts: that of the mass said over her by Guibourg, and further, the agreement between them in regard to the powders prepared by Galet for the king, in which Madame de Montespan was named; and the charges founded on these two facts do not depend wholly on what was said under torture, but were confirmed afresh by the same declaration in which La Filastre retracted the first charge.’

La Reynie thus defended himself and justice, and soon, strong in the rights of the law, he went on from defence to attack. He revealed to the minister the relations which several of the Vincennes prisoners who were mixed up in Madame de Montespan’s affair had had with persons of the Court.

These had given instruction and counsel. La Reynie condemned these manœuvres before the very minister who, at the instigation of the king, had been their author.

‘And several of these prisoners of rank,’ he added courageously, ‘have found means of having some of the charges brought against them withdrawn.’

La Reynie was not satisfied with denying the innocence of Mademoiselle Desœillets; he told Louvois: ‘It is difficult for her to be left at liberty after such charges. Apprised of all that has been said against her, she is busy taking measures to render her conviction impossible, and she will take these measures along with other ill-disposed persons.’

In case he should not be authorised to arrest her, La Reynie asks that he may at least be permitted to proceed to her examination; and he sketches for Louvois a very skilful plan, showing the ingenious and subtle means by which, without violence or scandal, the confidante might be induced to reveal the truth.

It is hardly necessary to say that these propositions were rejected by Louis and his minister. The magistrate, nevertheless, persevered in the path he had marked out for himself, even after Louvois, to overcome his scruples, had enlisted the assistance of Colbert, the second of the all-powerful ministers.