 As early as 1848 Le Blant was commissioned to collect the inscriptions of the earliest days of Christianity in Gaul, and like de Rossi, he made an investigation of manuscripts, printed books, museums, churches, and the Gallo-Roman cemeteries.In 1856 appeared the first volume of his "Recueil des inscriptions chrétienne des Gaules antérieures au VIIIe siècle".The second volume of the work (Paris, 1865) obtained for its author his election as a member of the Académie des Inscriptions et Belles Lettres.