In 1804 he became a secretary of Napoleon, in 1805 Bishop of Poitiers.

On 12 May 1808 he was appointed as archbishop of Mechelen (resigned in 1815).

In 1812 he was awarded the position of the French ambassador in Warsaw, preparing the Concordat of 1813.

After the Napoleonic wars he published a series of books which portrayed Russia as a "despotic" and "Asiatic" power hungry to conquer Europe.

[1] This article about a Roman Catholic archbishop from France is a stub.