The Via Augusta (also known as the Via Herculea or Via Exterior) was the longest and busiest of the major roads built by the Romans in ancient Hispania (the Iberian Peninsula). According to the historian Pierre Sillières, who has supervised excavation of Roman sites in Spain to identify the exact route followed by the Via Augusta, it was more a system of roads than a single road. Approximately 1,500 km (930 mi) long, the Via Augusta was built to link Spain with Italy, running from the interior city of Gades (Cádiz) to the Pyrenees Mountains along inland valleys parallel to the coast of the Mediterranean Sea. As the main axis of the road network in Roman Hispania, it appears in ancient sources such as the itinerary inscribed on the Vicarello Cups as well in as the Antonine Itinerary.