The site of Douch had never been excavated at the time Serge Sauneron, director of the IFAO, began de-sanding the area of the temple of the early Roman Empire in 1976. Before reaching the paved floors, the excavations revealed several levels of occupation under the Late Roman Empire. These campaigns and those subsequent, up until 1994, revealed the existence of several buildings preceding Roman times, such as a Ptolemaic brick sanctuary beneath the temple and other even older buildings, at the least dating back to the Persian time. The history of the archaeological works is followed by six chapters on the architecture of the buildings in the area: the enclosures and their doors, the courtyards and their fittings, the temple and its column porch, the chapel attached to a fault in the ground, probably a place of primitive worship. The text is amply illustrated with maps, sections and elevations. Examination of the construction details enabled to determine the chronological succession of the buildings, and to explain some anomalies or to restitute some of the parts destroyed. The dating of the main brick buildings and their remodeling was possible thanks to Michel Wuttmann who, from 2007 to 2011, had plants extracted from the walls, which were then collected and analyzed by radiocarbon. These new chronological markers allow to propose, in the last chapter, some restitutions of the successive states of the sanctuary in plan and perspective, from the Persian period to the Late Roman Empire.