The preventive archaeological excavation carried out in 2013-2014 in Meulan by Erica Gaugé, on the Annonciades site, is located on the heights of the Hautil, near the former castle of the Counts of Meulan (11th-14th century). It was completed by a new preventive excavation in 2017 (C. Pesenti) on a neighbouring plot to the west. These two operations revealed several phases of occupation between the 11th century and the contemporary period. A few sporadic remains of settlements from the 12th-13th centuries, contemporary with the Count’s castle, have been uncovered. In the 13th-14th centuries, the area was occupied by a vast limestone quarry, but also by craft activities (potter’s kiln) and domestic activities. In the 15th and 16th centuries, the area appeared to be more densely urbanised, as evidenced by both the remains of buildings (walls, cellars, ice house, etc.) and textual sources, and was included in the new urban enclosure built after 1589. The ensemble was then largely disrupted by the establishment of the Annonciades convent (17th-18th centuries). The documentary and archival study carried out for this site was based mainly on the analysis of old plans (18th-19th century), in particular a land plan drawn up for the Prince of Conti in 1770, and on the examination of the Annonciades de Meulan collection held in the Yvelines Departmental Archives (Arch. dep. 78, 60H 1 to 6). It has enabled us to better understand the topography of the site at the beginning of the 17th century, as the texts testify to the presence of a residential area distributed by several streets, bordering the remains of the castle, and certainly established during the 15th and/or 16th centuries. This has made it possible to nuance the traditional vision of a sector that would have been totally abandoned following the destruction of the castle of Meulan around 1364. The analysis of the Annonciades’ archives also made it possible to establish the precise chronology of the establishment of the convent from 1639 and the successive phases of their campaigns of land acquisition, construction, demolition and extension of the convent until the end of the 17th century. The documentary and archival study has therefore enriched the archaeological data by providing information that was almost impossible to observe during excavations (urbanisation of the Hautil hillside between the 15th and early 17th centuries; chronology of the convent’s construction; etc. The chronology of the convent’s construction was often rendered illegible by the recovery of materials in the 19th-20th centuries) and, on the other hand, helped to interpret the remains uncovered – in particular the function of the conventual buildings, with the comparison of written and archaeological data also revealing certain adaptations during the works.