But I must go back a little, and speak of two marriages that took place at the commencement of this year the first (most extraordinary) on the 18th February the other a month after.

The King was very anxious to establish his illegitimate children, whom he advanced day by day; and had married two of them, daughters, to Princes of the blood. One of these, the Princesse de Conti, only daughter of the King and Madame de la Valliere, was a widow without children; the other, eldest daughter of the King and Madame de Montespan, had married Monsieur le Duc (Louis de Bourbon, eldest son of the Prince de Conde). For some time past Madame de Maintenon, even more than the King, had thought of nothing else than how to raise the remaining illegitimate children, and wished to marry Mademoiselle de Blois (second daughter of the King and of Madame de Montespan) to Monsieur the Duc de Chartres. The Duc de Chartres was the sole nephew of the King, and was much above the Princes of the blood by his rank of Grandson of France, and by the Court that Monsieur his father kept up.

The Memoirs of Louis XIV., His Court and The Regency, Complete — Part 26

The marriages of the two Princes of the blood, of which I have just spoken, had scandalised all the world. The King was not ignorant of this; and he could thus judge of the effect of a marriage even more startling; such as was this proposed one. But for four years he had turned it over in his mind and had even taken the first steps to bring it about. It was the more difficult because the father of the Duc de Chartres was infinitely proud of his rank, and the mother belonged to a nation which abhorred illegitimacy and, misalliances, and was indeed of a character to forbid all hope of her ever relishing this marriage.

The Memoirs of Louis XIV., His Court and The Regency, Complete — Part 26

In order to vanquish all these obstacles, the King applied to M. le Grand (Louis de Lorraine). This person was brother of the Chevalier de Lorraine, the favourite, by disgraceful means, of Monsieur, father of the Duc de Chartres. The two brothers, unscrupulous and corrupt, entered willingly into the scheme, but demanded as a reward, paid in advance, to be made “Chevaliers of the Order.” This was done, although somewhat against the inclination of the King, and success was promised.

The Memoirs of Louis XIV., His Court and The Regency, Complete — Part 26

The young Duc de Chartres had at that time for teacher Dubois (afterwards the famous Cardinal Dubois), whose history was singular. He had formerly been a valet; but displaying unusual aptitude for learning, had been instructed by his master in literature and history, and in due time passed into the service of Saint Laurent, who was the Duc de Chartres’ first instructor. He became so useful and showed so much skill, that Saint Laurent made him become an abbe. Thus raised in position, he passed much time with the Duc de Chartres, assisting him to prepare his lessons, to write his exercises, and to look out words in the dictionary. I have seen him thus engaged over and over again, when I used to go and play with the Duc de Chartres. As Saint Laurent grew infirm, Dubois little by little supplied his place; supplied it well too, and yet pleased the young Duke. When Saint Laurent died Dubois aspired to succeed him. He had paid his court to the Chevalier de Lorraine, by whose influence he was much aided in obtaining his wish. When at last appointed successor to Saint Laurent, I never saw a man so glad, nor with more reason. The extreme obligation he was under to the Chevalier de Lorraine, and still more the difficulty of maintaining himself in his new position, attached him more and more to his protector.