The third volume of the Le Yaudet excavation reports details the history and archaeology of the site from AD 300 until the present day. The promontory overlooking the estuary of the river Léguer was reoccupied in the late fourth century, possibly by a military detachment from Britain, and thereafter developed as an ecclesiastical site in the fifth to eighth centuries. In the later medieval period it became a village clustered around the chapel. The report presents the archaeological and material evidence for these periods in detail.