The youngest, Marie Anne, became the Duchesse de Bouillon. She had the ready wit of all the Mancinis, and her repartees in the "Poison Affair," the _cause célèbre_ of the reign of Louis XIV., should still be remembered, as well as her patronage of La Fontaine. Her life was, on the whole, decorous enough, according to the seventeenth-century standard of propriety, but, while more or less eventful, extremely uninteresting by contrast with that of Olympe, Marie, and Hortense. It is these three that one means when one mentions Mazarin's nieces. They gave Europe much to talk of in their day, and have given it much to write about since.
It was lucky for Olympe that she was not born in the present century; if she had lived now she would probably have spent the greater portion of her career in prison and died on the gallows. But with over two hundred years between her and us she seems rather picturesque. Brought up in the same nursery, so to speak, with Louis XIV. and his contemptible brother, Philippe d'Orléans, Olympe Mancini aspired to be Queen of France. This splendid destiny seemed possible of fulfilment, for the young King was smitten and the Cardinal was favourable. But if Anne of Austria was ready enough to be Mazarin's mistress, she objected to marrying her son to Mazarin's niece. Anne was a Spaniard and a Hapsburg; she could stomach anything but a _mésalliance_. The result of Olympe's aspirations was, we know, such a _mauvais quart d'heure_ with Anne for the Cardinal as to terrify him. Olympe, however, was _intrigante_, and waged a sort of Fronde of her own in the Palais Mazarin, till Louis, who had never been very fond of her, fell head over ears in love with her sister Marie. Then she suffered her uncle to marry her to a younger son of the House of Savoy, the Comte de Soissons. One of their sons was afterwards world-famous as Prince Eugene of Savoy. But marriage did not, unfortunately for her, "settle" the Comtesse de Soissons; plotting and mischief-making generally, mixed up with a _liaison_ or two, kept her busy till the bursting on society of the "Poison Affair," in which she was implicated. The order for her arrest was issued, but Louis, glad to be rid of her, gave her the chance to flee the country. She lived henceforth the shadiest of lives wandering about Europe.