On April 6, Madame de Sévigné wrote: ‘Madame de Montespan is enraged; she cried a good deal yesterday, and you may guess the martyrdom her pride is suffering.’ On June 15, she replies to her daughter: ‘It is an infernal position, as you say, that of her who goes four paces ahead’ (alluding to Madame de Montespan).
She launched out into epigrams against her fortunate rival, just as she had satirised Louise de la Vallière. ‘Madame de Montespan,’ writes Bussy-Rabutin, ‘seeing that the great Alcandre (Louis XIV) was drifting away from her more and more every day, became so choleric that she began publicly to abuse Mademoiselle de Fontanges. She told every one that the great Alcandre was surely not very fastidious to love a creature who had had her little love affairs in the country; that she had neither wit nor education; and that, properly speaking, she was only a beautiful painting. She said a thousand other things about her equally irritating. Indeed, she always displayed the same proud spirit which nothing had been able to quell.’
Mademoiselle de Fontanges responded by loading her predecessor and all her children with costly presents. She had just been proclaimed a duchess with an annuity of 20,000 crowns. The fury of Madame de Montespan broke out. She had a violent scene with Louis, and when the king reproached her with her pride, her domineering spirit, and other defects, she replied with haughty scorn, concentrating all the violence of her wrath in one of those hard and bitter words which had made her so much feared in the time of her reign; she answered, ‘that if she had the imperfections of which he accused her, at any rate she did not smell worse than he.’
‘My mother,’ said the girl Monvoisin, ‘told me that Madame de Montespan wanted at that time to go to extremities, and tried to induce her to do things for which she had much repugnance. My mother gave me to understand that it was against the king, and after hearing what had passed at the house of Trianon (a sorceress, partner of La Voisin), I could not doubt it.’ The deserted mistress resolved to put an end to Louis and Mademoiselle de Fontanges. She applied to the sorceress of Villeneuve-sur-Gravois, and had no difficulty in getting together four accomplices in the terrible room in the Rue Beauregard: these four were La Voisin and La Trianon, who undertook to put Louis out of the way, and Romani and Bertrand, ‘artists in poisons,’ who promised to kill Mademoiselle de Fontanges. Madame de Montespan gave them money.
The king was to be poisoned first. La Voisin and her associates intended at first to put magic powders, prepared according to the formulae of the conjuring books, on the clothes of the king, or in some place where he was to pass, ‘which Mademoiselle Desœillets, the companion of Madame de Montespan, said could be done easily.’ The king would die of decline. But after reflection, La Voisin decided on means, the execution of which struck her as more certain. In conformity with the ancient custom of the kings of France, Louis XIV used to receive in person on certain days the petitions presented by his subjects. Everybody was introduced to his presence without distinction of rank or condition. It was resolved to prepare a petition and steep it in powders that had gone under the chalice; the king would take it in his hands and get his death-blow. La Trianon undertook the preparation of the paper, and La Voisin to place it in the hands of the king.
The petition was drawn up. The king’s intervention was asked in favour of a certain Blessis, an alchemist whom the Marquis de Termes was keeping confined in his château. La Voisin betook herself to her friend Léger, a valet de chambre of Montausier, and asked of him a letter of recommendation to one of his friends at Saint-Germain, who would get her passed in among the first to an audience with the king, so that she might herself hand him her petition. Léger replied that it was unnecessary for her to go to Saint-Germain, as he would undertake to forward the petition by a sure route; but the sorceress insisted on presenting it herself.
The boldness of La Voisin terrified the most courageous of her companions. The majority of them feared, not death, but the horrible tortures reserved by the law for regicides. In order to frighten her, La Trianon cast her horoscope. This document was found among the papers seized on the sorceress by the Chambre Ardente. La Trianon foretold that La Voisin would be implicated in a trial for a crime against the state. ‘Bah!’ she replied, ‘there are 100,000 crowns to be gained.’ That was the price agreed upon by La Voisin and Madame de Montespan for the poisoning of Louis XIV.
La Voisin set out for Saint-Germain on Sunday, March 5, 1679, accompanied by Romani and Bertrand. She returned on Thursday, March 9, very much put out: she had not been able to approach the king so as to give him the petition. She could have put it on the table placed near the king for that purpose, but the paper was useless unless it were placed in the king’s own hands. She said that she would return to Saint-Germain, and when her husband asked her what the urgency was, she replied: ‘I must accomplish my design or perish in the attempt!’ ‘What! perish!’ exclaimed Monvoisin, ‘that’s a good deal for a piece of paper.’
On Friday, March 10, the ‘missionaries'—priests of a community founded by St. Vincent de Paul, which has already been mentioned—paid a visit to the sorceress. La Voisin took fright, and gave the petition to her daughter to burn, which Marguerite did at dawn on Saturday morning. It is needless to say that the paper had always been kept in an envelope, for to touch it, said the sorceresses, would be certain death. On Sunday, March 12, La Voisin was arrested; it was on Monday the 13th that she had meant to return to Saint-Germain. News of the arrest got abroad, and on Wednesday, March 15, Madame de Montespan fled from Court.
In a succession of hasty notes—the sentences are not even completed, and we have filled them out for greater clearness—La Reynie builds up a proof of the attempt on the life of Louis XIV, planned by La Voisin as the instrument of Madame de Montespan:—