In 1748 he was admitted as a member of the Academy of Inscriptions, and in 1752 he was nominated professor of Latin eloquence at the Collège de France.
From 1755 onward, he held the office of perpetual secretary to the Academy of Inscriptions, in which capacity he edited fifteen volumes (from the 25th to the 39th inclusive) of the Histoire of that institution.
[1][2] He is best remembered as the author of Histoire du Bas-Empire, en commençant à Constantin le Grand, in 22 volumes (Paris, 1756–1779).
Its usefulness arises entirely from the fact of its being a faithful resume of the Byzantine historians.
Five volumes were added by H.-P. Ameilhon (1781–1811), which brought the work down to the fall of Constantinople.