Voltaire, from Ferney on the borders of Switzerland – into which country he could escape should the French authorities decide to regard his outspokenness as treason – followed the case with great attention; he wrote to Madame Calas and asked her if she would swear to him that her husband was innocent.
Having received her reply in the affirmative, Voltaire then brought his genius into play. He was going to have the verdict against Calas reversed; not only that, he was going to put an end to religious persecution in France for all time.
He began by writing letters to Saint-Florentin, Duc de la Vrillière, who was known as the ‘Minister of the lettres de cachet’ because he allowed his mistress to sell them at fifty louis each. Artfully Voltaire suggested that Saint-Florentin must feel as disturbed by this affair as he was. Saint-Florentin, thus brought into the limelight, while protesting that the affaire Calas was a matter for the Justiciary, was made uneasy because he felt that Voltaire was shining a light on the prisons which were full of those who, because some person of influence had wished them out of the way, had received their lettres de cachet.
The campaign was fierce and long. That was what Voltaire intended it should be. The wits and savants took it up; the injustice of the punishment meted out to Monsieur Calas was discussed among the writers and philosophers.
Choiseul watched not without pleasure. He was on the side of Voltaire, eager as ever to see the Church in a subordinate position.
The force of public opinion stirred up by the fiery writings of Voltaire brought about the release from prison of Madame Calas who immediately left Toulouse to find refuge at Ferney.
This took place immediately before the expulsion of the Jesuits; and Choiseul, eager to score a trick against Saint-Florentin, released a certain young man from service in the galleys. This was Fabre, whose father had been sentenced to serve there. Fabre had made possible his father’s escape by taking his place.
When this was discovered there had been a certain outcry and a demand that such a saintly young man should be given his liberty. Saint-Florentin had retorted that Fabre had defied the law and, since he had placed himself in a position to take over his father’s service, he should do so.
Choiseul now stepped in. He had an eye for public approval. The Calas case had aroused deep feeling throughout France and he felt that a large public opinion was in favour of tolerance.
He therefore ordered that Fabre be given his freedom. Saint-Florentin was furious, but he could do nothing against the all-powerful Choiseul.
Meanwhile Voltaire’s pamphlets continued to be received in Paris, and when he heard that the Toulouse Parlement was planning to re-arrest Madame Calas he suggested she go to Paris, which was more liberal-minded than any city in France, and there plead her cause.
While Madame Calas was travelling to Paris, Saint-Florentin made a great effort to discredit Voltaire and with him his ally Choiseul.
He employed a talented writer, Fréron, to write an article, which was supposed to have appeared in an English paper, attacking the King.
Choiseul’s spies however had brought him information that this was about to be launched in Paris; whereupon Voltaire’s venomous pen produced such attacks on Fréron as to make that man quiver with rage and terror, and Voltaire had little difficulty in proving the article to be a forgery.
The Toulouse Parlement meanwhile had busied itself to bring another case against the Protestants; and when a young girl was found dead in a well, her father, a Monsieur Sirven who was a Protestant, was accused of murdering her because, the Parlement declared, it was a custom of Protestants to murder their children.
However, Voltaire’s invective and the knowledge that the all-powerful Choiseul was supporting him, encouraged others to be bold.
It was proved that the only witness in the case was a small child, who had been alternately bribed and threatened to say that she had seen Monsieur Sirven throw his daughter into the well. The truth was discovered to be that the child had been taken from her parents and put into a nunnery to learn to become a Catholic. The child had fretted for her parents and home, and because of this had been ill-treated. When she showed signs of madness she was sent home where, fearful that she should be taken back to the nunnery, she killed herself by jumping down the well.
Voltaire immediately offered refuge to the Sirven family who hastened to cross the mountains of the Cevennes and reached Ferney.
The fiery writer made the most of this and received visitors from all over the world to whom he made the Sirvens tell the story of their wrongs.
His writings had been circulated abroad, and the result was that England and Russia, probably to humiliate France, started to raise funds for the persecuted Protestants in that bigoted country.
Choiseul stepped in. He knew that he was striking a formidable blow at the Jesuits. He demanded that the Parlement of Toulouse give up the papers appertaining to the Calas case, and that it be tried in Paris.
He himself received Madame Calas and her daughters, treated them with the utmost respect, assuring them that he would be their advocate; he even put them into a carriage and had them driven round to see the wonders of the capital.
All Paris was impressed by the dignified demeanour of Madame Calas, and Choiseul knew that he had the people behind him.
All this had happened before the death of the Dauphin, and the Dauphine knew that her husband had been watching the Calas case with the utmost interest.
In the tragedy which had overtaken her she had forgotten that the case was still awaiting judgement.
Now, after the King had told her that he wished to be her friend, the news was brought to her that a verdict had been given in this case in favour of Madame Calas, who was given money and once more allowed to use the family escutcheon. This was tantamount to a declaration that her husband had been wrongfully executed.
Voltaire was exultant. He had proved the power of the pen. From that year, 1765, there were to be no more persecutions of Protestants in France.
When the Dauphine heard the way events were moving she made up her mind.
This was a further blow at that bigotry which the Dauphin had supported. Voltaire, who was called an atheist, Choiseul, who went to church merely because etiquette demanded that he should, had struck a blow against all that the Dauphin had worked for.
If she had had any doubts before, the Dauphine was now determined. She was going to stop grieving for her husband, and work as he would have worked. She would not rest until she had driven the Duc de Choiseul from the position he now held.
Having quickly become aware of the Dauphine’s animosity, the Duc de Choiseul was uneasy. He sought out his sister and suggested that they take a turn in the gardens, explaining to her that what he had to say should be said out of doors.
When they paused by the fountain, he said:
‘I feel apprehensive about the Dauphine.’
‘That little fool!’
‘Yes,’ murmured Choiseul.
‘I always thought her mild as milk,’ said the Duchess de Gramont. ‘Now she is not even that. She is weak as water.’
‘Have you noticed the King’s affection for her?’
‘The King!’
Choiseul laughed merrily. ‘He has not decided to make her his mistress, if that is what you are thinking,’ he said. ‘But he is going through a dismal period. He still thinks of the Marquise and imagines he needs comforting. The Dauphine, like the virtuous widow she is, mourns for her husband. So they put their heads together and become maudlin over their lost loved ones. It makes a bond.’