The colloquium “Quand l'archéologie construit ses archives” was organised by the musée d'Archéologie nationale in partnership with the Archives nationales, financed by the labex research project Les passés dans le présent. This event, which brought together archivists, museum professionals and archaeologists, was the opportunity to present the results of the Commission de Topographie des Gaules research project for the first time, to demonstrate the wealth of the archive collection studied, and to rehabilitate an administrative commission that had disappeared into oblivion.