Mentioning by chance his interest in the funding of Roman roads to Conde du Lis, advisor to Louis XIII, he found himself suddenly commanded by the king to undertake a study of all Roman roads.
Five years later he published his Histoire des Grands Chemins de l'Empire Romain,[1] a two-volume work of over 1000 pages.
Edward Gibbon consulted Bergier's work while researching his Decline and Fall of the Roman Empire.
Bergier taught at the Collège des Bons-Enfants and at the Faculty of Law of the University of Rheims.
Bergier worked with Charles du Lys, lawyer, and Nicolas Brulart de Sillery, Chancellor of France.