Michel Tronchay was a French Catholic priest, writer, philosopher, and the secretary of French historian Louis-Sébastien Le Nain de Tillemont. After Tillemont's death, Tronchay completed and published volumes 6–16 of Mémoires pour servir à l'histoire ecclésiastique des six premiers siècles, a history of the first six centuries of the Christian church. He also completed and published the final volume 6 of Histoire des empereurs et autres princes qui ont régné pendant les six premiers siècles de l'Église, a history of the Roman Empire. That work was often cited by Edward Gibbon in his Decline and Fall of the Roman Empire.