I didn’t go that far… I just saw that you mentioned the date of 1860 and I immediately assumed the Nadaillac’s as part of the new royalty “signed in” after the coup d’etat de Louis Napoleon. But guess LN was just restoring the old titles then…Actually if you follow that link, they are in the "History books" since 1313 with the first ancestor being made Knight(Chevalier) You can see all the descendants from the direct line.
https://fr.wikipedia.org/wiki/Famille_du_Pouget_de_Nadaillac