The site of Ormoy-Villers highlights three main chronological phases. The first is associated with the discovery of two Y-shaped pits which remain undated, but which evoke an early period perhaps stretching from the Neolithic to Hallstatt. After that, scattered evidence points to a probable La Tène dwelling in the neighbourhood, noticeably a ditch with dumped bones of farm animals, and a piece of human long bone. An isolated silo may belong to this period. However, the main feature found at Ormoy-Villers "Le Gros Buisson" is a Gallo-Roman rural dwelling that appears during the Julio-Claudian dynasty, and continues to develop up to the middle of the 3rd century A.D. In the early stages of this dwelling, the space is structured by the digging of a square enclosure within which only hollow features are to be found: pits, secondary ditches and a storeroom. Later, at the turn of the 1st and 2nd centuries A.D., the dwelling is still organized within the limits of the old enclosure, but now at least one building on massive foundations is erected. The 2nd century A.D. is a period of full expansion when two cellars are built, and probably another building on massive foundations; as concerns this building, it has been extensively salvaged. The artefacts and other remains belonging to the 2nd century and the first half of the 3rd century are the most numerous and diversified on this site. This reflects a propitious period of building expansion and the adoption of a "Roman way of life" by the inhabitants. The graffiti on two jugs, the slate cosmetic palette, some sculpted fragments, are unusual items to find in a rural environment, and raise questions about the real status of such a settlement. Nevertheless prudence is indicated in a geographical area about which generally little is known, and where the typology of the Roman occupations is not yet understood. Indeed, the number of excavated sites in Valois is still too small to provide an overview of the Gallo-Roman dwellings on this plateau, such as has been achieved in other places like the Somme or the Pays de France. Our aim is thus to present the site of Ormoy-Villers in comparison with what could be observed in the excavations of the TGV Nord [North High Speed Train] (early 1990’s) and of the gas pipeline of the Arc of Dierrey (2014), and more widely in Picardy and its fringes. The statistical results of the field walking campaigns undertaken in the Valois are also an essential source of data. Traduction : Margaret & Jean-Louis CADOUX