Jean-Pierre, Count of Montalivet

Although supportive of the French Revolution, Bachasson enlisted in the Army of Italy in order to escape the Reign of Terror.

With the start of the French Empire, Bachasson joined the Conseil d'État, became director of the Legion of Honor, and, from 1806, head of the Corps des Ponts et Chaussées.

As Minister, Bachasson helped develop the infrastructure within the Empire by, for example, authorising the construction of new bridges and ports.

In 1814, after the Six Days' Campaign, Bachasson accompanied Empress Marie Louise all the way to Blois, and then retired to his property in Montmeyran.

He married Louise Françoise Adélaïde de Saint-Germain (Versailles, Yvelines, 13 January 1769 – Thauvenay, 10 March 1850), who was said to be a daughter of Louis XV of France - with whom she shared the same striking resemblance in the strongly marked Bourbon traits also found in other of his illegitimate offspring - by Catherine Eléonore Bernard (1740–1769), and had issue: