Summary International audience The aim of this presentation is to take stock of the investigations carried out from 2009 to 2016 on the early Christian and medieval site of Yereryuk, in the Shirak marz, in far north-western Armenia, by the LA3M laboratory of medieval archaeology (Aix Marseille University) in cooperation with the Institute of Archaeology and Ethnography NAS RA, represented on site by the Regional Museum of Shirak.The survey focused on the Yereruyk basilica, its dating, architecture, carved decor, its place in early Christian Armebua and links with Syria, as well as the hypothesis of a pre-Christian stratum. Attention was also given to the memorial area south of the church, with remains of monuments once supporting cross-topped stelas. The excavations in this zone have brought to light a cemetery, in which the examination of more thant 70 graves yielded 27 dates obtained by radiocarbon analysis of human bones. It allowed the exploration of the hitherto poorly studied area of funerary archaeology in medieval Armenia, providing a first picture of the evolution of a Christian cemetery from late Antiquity almost to the 20th century.Geomorphological and archaeological studies carried out on the remains of monuments located to the east of the basilica are providing a better understanding of the function of these constructions and to approach their dating. The presentation reviews the results achieved by the mission, the questions raised by its investifations, some proposed answers, as well as the enigmas that still remain.