The region joined the Roman Empire. In 47, Emperor Claudius founded Forum Claudii Augusti, later renamed Forum Claudii Vallensium to avoid confusion with another city that was dear to him. Octodurus was the principal town of the area until the displacement of the episcopal see to Sion in the 4th century. Pliny (iii. c. 20) says that the Octodurenses received the "Latinitas" ("Latio donati"). The town appears in the Antonine Itinerary and in the Tabula Peutingeriana. In the "Notit. Prov.", the place is called Civitas Vallensium Octodurus. At a later period it was called Forum Claudii Vallensium Octodurensium, as an inscription shows. One authority speaks of the remains of a Roman aqueduct at Martigny. Many coins, and other memorials of the Roman time, have been found about the place.