This excavation followed an archaeological assesment in 2009 prior to the construction of a town hall and apartment buildings with basements. Located a few meters from the church of Saint-Martin, built in the twelfth century, this site is characterized by uninterupted occupation. The structures and artefacts date from the Merovingian period to the present/modern, with some material dating from the Lower Empire. Medieval, Modern and Contemporary dwellings are situated on an occupation dating back to the High Middle Ages. The Merovingian activity is confirmed mainly by the presence of ovens for culinary use, a probable attic, burials and ditches, while the Carolingian occupation is essentially represented by a kiln and hut foundations. Remains of buildings and related activities, such as pits and post holes, characterize the Classical Middle Ages and the Late Middle Ages. At that time, it seems that the site activity began to reorganize and move towards the main street of the village. An extraction pit, plaster pits as well as buildings could be dated to the end of the Middle Ages and the Modern Period. These pits, filled with construction material, attest to the destruction of the previous period. These buildings would last up to the present day. At 1,200 m², the site of « 13-21, rue de Paris » is a window to the origins of Plailly. Many issues, ongoing for years, concern the foundation of villages and are important to our thinking about medieval settlement. Traduction : John Lynch