She was born in Paris in 1725, and in 1746 was married to the Comte de Boufflers-Rouvrel; soon after, becoming enamored of the Prince de Conti, she became his acknowledged mistress. To give an idea of the light in which the women of that time considered those who were mistresses of great men, the following episodes may be cited: One day, Mme. de Boufflers, momentarily forgetting her relations to the Prince de Conti, remarked that she scorned a woman who _avait un prince du sang_ (was mistress of a prince of the blood). When reminded of her apparent inconsistency, she said: "I wish to give by my words to virtue what I take away from it by my actions...." On another occasion, she reproached the Maréchale de Mirepoix for going to see Mme. de Pompadour, and in the heat of argument said: "Why, she is nothing but the first _fille_ (mistress) of the kingdom!" The maréchale replied: "Do not force me to count even unto three" (Mme. de Pompadour, Mlle. Marquise, Mme. de Boufflers). In those days, the position of mistress of an important man attracted little more attention than might a petty, trivial, light-hearted flirtation nowadays. After the death of M. de Boufflers, in 1764, the all-absorbing question of society, and one of vital importance to madame, was, Will the prince marry her? If not, will she continue to be his mistress? In this critical period, Hume showed his friendship and true sympathy by giving Mme. de Boufflers most persuasive and practical advice in reference to morals--which she did not follow. Her relations with Rousseau showed her capable of the deepest and most profound friendship and sympathy. According to Sainte-Beuve, it was she who, by aid of her friends in England, procured asylum for him with Hume at Wootton. When Rousseau's rashness brought on the quarrel which set in commotion and agitated the intellectual circles of both continents, Mme. de Boufflers took his part and remained faithful to him, securing a place for him in the Château de Trie, which belonged to the Prince de Conti.