From 1744 he was constantly in Paris busied with historical research. He was a member of the Académie des Inscriptions, and several other learned bodies.
He died in Paris.
His first work concerned the history of his native city and its bishops, and was entitled "Histoire des évêques de Nîmes" (2 vols., The Hague, 1737). Later he enlarged this work, and between 1760 and 1758 he published at Paris the "Histoire civile, ecclésiastique et littéraire de la ville de Nîmes" in seven volumes with illustrations. An abridgement appeared at Paris in 1790, and one at Nîmes in 3 vols., 1831-33.
He also wrote:
- "Les Amours de Callisthène et de Chariclée", The Hague, 1740, Paris, 1753 (also Paris, 1765, under the title of "Callisthène ou le modèle de l'amour et de l'amitié");
- "Mœurs et usages des Grecs" (Lyons, 1743), a widely read work which became the model of similar productions.
In addition he wrote a number of articles for periodicals, especially on topics from the history of France in Roman times. In 1762 the Magistracy of Avignon sent for him and confided to him the task of writing a history of that city. But after two years of work he was constrained by ill-health to leave it unfinished.
- Le Beau, "Praise Ménard" in Memoirs of the Academy of Inscriptions
- Alexander Charles Germain, Leon Ménard, his life and his works, according to the most authentic original documents, manuscripts. autographs, family papers, etc., Montpellier: Impr. Martelaine of 1857
- Gustave Bayle, Leo Menard, author of the History of Nimes, Avignon, Nîmes: impr. F. Chastanier 1895
- This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Léon Ménard". Catholic Encyclopedia. Robert Appleton Company. The entry cites:
- Le Beau, Éloge de Ménard in Mem. de l'Acad. des Inscript.