 The date of Foundation of Cherbourg can not be set precisely, although several local historians, including Robert Lerouvillois, trace the origin of the city to Coriallo (for *"Coriovallo") of the Unelli.According to Pierre-Yves Lambert, the Celtic element "corio-" means "army, troop" and the element "vallo-" similar to the Latin "vallum", would be "rampart, fortification".Mentioned on the "Tabula Peutingeriana" (c. 365), in the Antonine Itinerary and the "Gesta" de Fontenelle ("In pago Coriovallinse", 747-753), "Coriallo", Latinised then as "Coriallum", hosted a Roman garrison during the late Roman Empire, and the recovered remains would be the village between Cherbourg and Tourlaville, on the Mielles.