A study day organized in the second half of 2027 by Didier Bayard (SRA, DRAC Hauts-de-France), Frédérique Blaizot (HARTIS, ULille), Lydie Blondiau (HARTIS, Inrap), and Pierre-Yves Groch (HARTIS, Inrap) will examine the pauses and continuities in the use of land in Northern Gaul during the Late Roman Empire. This event seeks to highlight the progress made over the past thirty years in understanding the history of the area, especially through the development of preventive archaeology and related scientific methods. These advances have shed light on various time periods and aspects of life in ancient France, though the knowledge is not evenly spread across all regions and eras. The Late Roman Empire is seen as a time of major transformation, spanning two to three centuries and representing a shift between classical antiquity and the Middle Ages. Well-documented changes include the shrinking of cities into military encampments called castra, the abandonment of small farms and some large estates known as villae, and the building of forts along important roads. Recent studies suggest that the homes of the elite might no longer be connected to agricultural land, which raises questions about the survival of a social model that had existed from the La Tène period through the fourth century. Archaeological evidence from this time includes the stop of coin production in Gaul around 398-402, with no coins found after these dates at sites. Ceramics from the fifth century are rare and often hard to identify. The lack of data from the fifth and sixth centuries creates many questions, such as whether the decline in agricultural settlements indicates people moving together or a change in farming methods. In the Hauts-de-France region, remains from the Late Empire are described as flat, isolated, and scattered. Most information comes from urban areas like Thérouanne, Amiens, and Famars, with little known about the rural areas. Large estates that changed in the fourth century did not last beyond the middle of the fifth century. Excavations in the Aisne Valley provided useful insights, but no similar sites have been found since. Transition sites between the Roman and Merovingian periods are rare, and in some cases, a shift can be assumed. A widely accepted idea is that many settlements from this time evolved into today's towns and villages, making a significant part of the remains hard to find. This might explain the discovery of Merovingian cemeteries near Roman agricultural sites without matching settlements. Despite these challenges, research on the Late Empire continues to be an active area, with ongoing discoveries and collaboration across disciplines. The study day aims to gather archaeologists and experts in fields like ceramics and archaeozoology to further understand this period in the Hauts-de-France region.