Valentine will be beneficiary of a fortune. Who's fortune

"I do not know; but, though unwilling to introduce money matters into our present conversation, I will just say this much—that her extreme dislike to me has its origin there; and I much fear she envies me the fortune I enjoy in right of my mother, and which will be more than doubled at the death of M. and Mme. de Saint-Méran, whose sole heiress I am. Madame de Villefort has nothing of her own, and hates me for being so richly endowed. Alas, how gladly would I exchange the half of this wealth for the happiness of at least sharing my father's love. God knows, I would prefer sacrificing the whole, so that it would obtain me a happy and affectionate home."