Career
A career soldier, his military appointments included Captain in the Royal-Cuirassiers from 1706, Colonel of the Regiment of Poitou and Brigadier-General from 1719, Maréchal de camp in 1734, Governor of Le Quesnoy from 1735, before promotion to Lieutenant-General of the French Army in 1738. Vicomte de Saint-Julien also served Louis XV of France as Ambassador to the Netherlands at The Hague from 1724, before being posted to London in 1741. Descended from an aristocratic family of churchmen, courtiers and soldiers, he was accorded the courtesy title of Vicomte de Saint-Julien.
Upon the death of his father François de Salignac in 1742, he succeeded in the family titles as Marquis de Fénelon et de Salignac, comte de Louisiana Motte, baron de Loubert, seigneur de Mareuil, de Boisse & de Péricard, et cetera