He became Colonel General of the Cent-Suisses et Grisons (1710), Governor of Languedoc (1737), Grand veneur de France and Count of Eu (1736).

“The Marquis de Coigny used to gamble with the Prince des Dombes, and lost a lot ; one day, he said through his teeth : he is happier than a legitimate child.

The ground was covered with snow ; they fought with torches : M. de Coigny was killed on the spot ; they put him back in his carriage, which they overturned in a ditch.

» In 1750, he gained the titles of prince d'Anet and comte de Dreux, when his mother gave him both estates three years before she died.

In order to supply water for his gardens, he created a hydraulic system which he installed in the park of the domain near the river Eure.