A judicial inquiry was now set on foot, and many witnesses examined. Among others, Anne Huet, an apothecary's daughter, who was a sort of servant of the marchioness, deposed, that one day, when the marchioness was intoxicated, she had the imprudence to show the witness a little box which she took out of a casket, and which, she said, contained the means of getting rid of her enemies, and acquiring good inheritances. Mademoiselle Huet saw that the box contained sublimate of mercury in powder and in paste. Afterwards, when the fumes of the wine had evaporated, the witness told the marchioness what she had said. "Oh," she said, "I was talking nonsense;" but at the same time she earnestly begged her not to repeat what she had heard. The marchioness (this witness added) was in the habit, when anything chagrined her, to say she would poison herself. She said there were many ways of getting rid of people when they stood in one's way,—a bowl of broth was as good as a pistol-bullet. The girl added, that she had often seen La Chaussée with Madame de Brinvillier, who chatted familiarly with him; and that she had heard the marchioness say, "He is a good lad, and has been very serviceable to me." Mademoiselle Villeray, another witness, declared that she had seen La Chaussée on a very familiar footing with Madame de Brinvillier; that she had seen them alone together since the death of the magistrate; that, two days after the death of the counsellor, she made La Chaussée hide himself behind the bed-curtains when the magistrate's secretary came to see her. La Chaussée himself, on his examination, admitted this fact. Other persons related that La Chaussée, when he was asked how his master was during his illness, used to say, "Oh, he lingers on, the——!" adding a coarse epithet; "he gives us a deal of trouble. I wonder when he will kick the bucket."
On the 4th of March 1673, the court of La Tournelle pronounced a sentence, whereby La Chaussée was convicted of having poisoned the magistrate and the counsellor, and condemned to be broke alive upon the wheel, after having been put to the question ordinary and extraordinary, to discover his accomplices; and the Marchioness de Brinvillier was condemned, by default, to be beheaded. Under the torture, La Chaussée confessed his crimes, and gave a full account of all the transactions we have related, in so far as he was connected with them. He was executed in the Place de Grêve, according to his sentence.
Desgrais, an officer of the Marechaussée, was sent to Liege to arrest the marchioness. He was provided with an escort, and a letter from the king to the municipality of that city, requesting that the criminal might be delivered up. Desgrais was permitted to arrest her and carry her to France.
She had retired to a convent, a sanctuary in which Desgrais durst not attempt to seize her; he therefore had recourse to stratagem. Disguising himself in an ecclesiastical habit, he paid her a visit, pretending that, being a Frenchman, he could not think of passing through Liege without seeing a lady so celebrated for her beauty and misfortunes. He even went so far as to play the gallant, and his amorous advances were as well received as he could desire. He persuaded the lady to take a walk with him; but they had no sooner got into the fields than the lover transformed himself into a police-officer. He arrested the lady, and put her into the hands of his followers, whom he had placed in ambush near the spot; and then, having obtained an order from the authorities to that effect, he made a search in her apartment. Under her bed he found a casket, which she vehemently insisted on having returned to her, but without effect. She then tried to bribe one of the officer's men, who pretended to listen to her, and betrayed her. During her retreat she had carried on an intrigue with a person of the name of Theria. To him she wrote a letter, (which she intrusted to her confidant,) beseeching him to come with all haste and rescue her from the hands of Desgrais. In a second letter she told him that the escort consisted only of eight persons, who could easily be beaten by five. In a third, she wrote to "her dear Theria," that if he could not deliver her by open force, he might at least kill two out of the four horses of the carriage in which she was, and thus, at least, get possession of the casket, and throw it into the fire; otherwise she was lost. Though Theria, of course, received none of his chère amie's letters, yet he went of his own accord to Maestricht, through which she was to pass, and tried to corrupt the officers by an offer of a thousand pistoles, if they would let her escape; but they were immovable. All her resources being thus exhausted, she attempted to kill herself by swallowing a pin; but it was taken from her by one of her guards.
Among the proofs against her, that which alarmed her the most was a written confession containing a narrative of her life, kept by her in the casket which she made such desperate efforts to recover. No wonder she was now horrified at what she had thus committed to paper. In the first article she declared herself an incendiary, confessing that she had set fire to a house. Madame Sevigné, speaking of this paper, says, "Madame de Brinvillier tells us, in her confession, that she was debauched at seven years old, and has led an abandoned life ever since; that she poisoned her father, her brothers, and one of her children; nay, that she poisoned herself, to try the effect of an antidote. Medea herself did not do so much. She has acknowledged this confession to be of her writing,—a great blunder; but she says she was in a high fever when she wrote it,—that it is mere frenzy,—a piece of extravagance which no one can read seriously." In a subsequent letter, Madame de Sevigné adds, "Nothing is talked of but the sayings and doings of Madame de Brinvillier. She says in her confession that she has murdered her father;—she was afraid, no doubt, that she might forget to accuse herself of it. The peccadilloes which she is afraid of forgetting are admirable!"
The proceedings of her trial are fully reported in the Causes Célèbres. She found an able advocate in the person of M. Nivelle, whose pleading in her behalf is exceedingly learned and ingenious. He laboured hard to get rid of the confession; maintaining that this paper was of the same nature as a confession made under the seal of secrecy to a priest; and cited a number of precedents to show that circumstances thus brought to light cannot be used in a criminal prosecution. Her confused, evasive, and contradictory answers to the questions put to her on her interrogatory by the court,—a very objectionable step, by the way, of French criminal procedure,—were considered as filling up the measure of evidence against her; though, in this case, it was sufficiently ample without the aid either of her confession or examinations before the judges. The corpus delicti (in the language of the law) was certain. The deaths of her two brothers by poison were proved by the evidence of several medical persons; and the testimony of other witnesses established the commission of these crimes by St. Croix and her, through the instrumentality of La Chaussée.
At length, by a sentence of the supreme criminal court of Paris, on the 16th of July 1676, Madame de Brinvillier was convicted of the murder of her father and her two brothers, and of having attempted the life of her sister, and condemned to make the amende honorable before the door of the principal church of Paris, whither she was to be drawn in a hurdle, with her feet bare, a rope about her neck, and carrying a burning torch in her hands; from thence to be taken to the Place de Grêve, her head severed from her body on a scaffold, her body burnt, and her ashes thrown to the wind; after having been, in the first place, put to the question ordinary and extraordinary, to discover her accomplices.
Though she had denied her crimes as long as she had any hope of escape, she confessed everything after condemnation. During the latter days of her life, she was the sole object of public curiosity. An immense multitude assembled to see her execution, and every window on her way to the Place de Grêve was crowded with spectators. Lebrun, the celebrated painter, placed himself in a convenient situation for observing her, in order, probably, to make a study for his "Passions." Among the spectators were many ladies of distinction, to some of whom, who had got very near her, she said, looking them firmly in the face, and with a sarcastic smile, "A very pretty sight you are come to see!"
Madame de Sevigné gives an account of this execution the day it took place, in a tone of levity which is not a little offensive, and unbecoming a lady of her unquestionable elegance and refinement. "Well!" she says, "it is all over, and La Brinvillier is in the air. Her poor little body was thrown into a large fire, and her ashes scattered to the winds; so that we breathe her, and there is no saying but this communication of particles may produce among us some poisoning propensities which may surprise us. She was condemned yesterday. This morning her sentence was read to her, and she was shown the rack; but she said there was no occasion for it, for she would tell everything. Accordingly she continued till four o'clock giving a history of her life, which is even more frightful than people supposed. She poisoned her father ten times successively before she could accomplish her object; then her brothers; and her revelations were full of love affairs and pieces of scandal. She asked to speak with the procureur-général, and was an hour with him; but the subject of their conversation is not known. At six o'clock she was taken in her shift, and with a rope round her neck, to Nôtre Dame, to make the amende honorable. She was then replaced in the hurdle, in which I saw her drawn backwards, with a confessor on one side and the hangman on the other. It really made me shudder. Those who saw the execution say she ascended the scaffold with a great deal of courage. Never was such a crowd seen, nor such excitement and curiosity in Paris." In another letter the fair writer says, "A word more about La Brinvillier. She died as she lived, that is boldly. When she went into the place where she was to undergo the question, and saw three buckets of water, 'They surely are going to drown me,' she said; 'for they can't imagine that I am going to drink all this.' She heard her sentence with great composure. When the reading was nearly finished, she desired it to be repeated, saying, 'The hurdle struck me at first, and prevented my attending to the rest.' On her way to execution she asked her confessor to get the executioner placed before her, 'that I may not see that scoundrel Desgrais,' she said, 'who caught me.' Her confessor reproved her for this sentiment, and she said, 'Ah, my God! I beg your pardon. Let me continue, then, to enjoy this agreeable sight.' She ascended the scaffold alone and barefooted, and was nearly a quarter of an hour in being trimmed and adjusted for the block by the executioner; a piece of great cruelty which was loudly murmured against. Next day persons were seeking for her bones, for there was a belief among the people that she was a saint. She had two confessors, she said; one of whom enjoined her to tell everything, and the other said it was not necessary. She laughed at this difference of opinion, and said, 'Very well, I am at liberty to do as I please.' She did not please to say anything about her accomplices. Penautier will come out whiter than snow. The public is by no means satisfied."
This Penautier was a man of wealth and station, holding the office of treasurer of the province of Languedoc and of the clergy. He was discovered to have been intimately connected with St. Croix and Madame de Brinvillier, and strongly suspected of having been a participator in their crimes. He was accused by the widow of M. de Saint Laurent, receiver-general of the clergy, of having employed St. Croix to poison her husband, in order to obtain his place, and of having accomplished this object by means of a valet whom St. Croix had got into her husband's service. Penautier was put in prison; but Madame de Sevigné says that the investigation was stifled by the influence of powerful protectors, among whom were the Archbishop of Paris and the celebrated Colbert. In one of her letters she says, "Penautier is fortunate; never was a man so well protected. He will get out of this business, but without being justified in the eyes of the world. Extraordinary things have transpired in the course of this investigation; but they cannot be mentioned." He was released, resumed the exercise of his offices, and lived in his former splendour. The first people had no objection to enjoy his luxurious table; but his character with the public was irrecoverably gone. Cardinal de Bonzy, who had to pay some annuities with which his archbishopric of Narbonne was burdened, survived all the annuitants, and said that, thanks to his star! he had buried them. Madame de Sevigné, seeing him one day in his carriage with Penautier, said to a friend, "There goes the Archbishop of Narbonne with his star!"