Adelaide Unmarried

Information appreciated on subject.

Originally, the House of Orléans had no interest in marrying Philippe Egalité to Adélaïde of Bourbon-Penthièvre - other matches, namely, an infanta of Portugal, a Polish princess (sister to the Dauphine), and a Savoyard princess were considered.

However, the death of the prince de Lamballe without surviving issue, meant that Adélaïde was thus La Grande Mademoiselle 2.0 - the wealthiest heiress in France. Louis XV cautioned Penthièvre about marrying her to Orléans saying: "your daughter will not be happy, cousin."

Now, my question is, had Adélaïde remained unwed, (Orléans takes a Polish/Portuguese/Savoyard wife instead, the Comte de la Marche (Conti's son) is already wed, with no children, and Condé is already married to Bathilde d'Orléans (Egalité's sister)) who would've stood as her closest heir (male or general)?
 
Barring a will, gift, sale or the possibility of Adélaïde marrying and having children of her own, they revert back to the Royal Domains in escheat as Adélaïde's father was the only surviving child of the original holder, the Comte de Toulouse. However, as fiefs were treated as personal property in the Ancien Régime, they could be bought, sold, gifted or otherwise disposed of by will of the seigneur (unless otherwise stipulated in their original grant, such as in the case of royal apanages).

Most likely, if she remains unmarried, we get a repeat of the division La Grande Mademoiselle's estates in OTL. She'll probably be pressured to sell or will her fiefs and properties to the Comte de Provence and the Comte d'Artois. Or, alternately, they may be willed to the Duc de Normandie to provide for him in the future—in OTL, Marie-Antoinette made several purchases in anticipation of providing for her younger son, such as the Château Saint-Cloud.
 
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