Now in ruins, the royal convent of the Poor Clares of Nogent-l’Artaud, founded in 1299, offers a truncated vision of its former appearance. This complex suffers in particular from a lack of historical and iconographic sources, notably because of the loss of a good part of the archives during the two World Wars. In this sense, two archaeological tests carried out in 2017 and the preventive excavation of 2018 and its interesting discoveries were a unique opportunity to propose a new understanding of the evolution of this religious complex from its creation until the Revolution. Thus, at least six distinct phases, punctuated by several periods of sometimes unprecedented work, have been identified, highlighting changes in the organisation of the peripheral areas of the convent and their functions. Located outside the typically planned central area, these operations mainly concerned the enclosed areas of the convent, namely their private courtyard to the south of the cloister, and their gardens to the east. Spaces and buildings for agriculture and/or gardening have been identified along with several latrines (collective and private), a vast hydraulic network supplying wells, basins and washhouses, but also many ditches. The excavated material, particularly dense and sometimes atypical, forms an exceptional record for the period and the region while revealing the particular status and wealth of the nuns. Beyond the convent of Nogent-l’Artaud, these discoveries shed new light on the way of life and the material culture of the Poor Clares.