Via Clodia was used by the Roman army to conquest of Etruria in the fourth century BC. In 225 BC it was paved.See:
- Clodia, Via, by Thomas Ashby, in: Encyclopædia Britannica, 1911
- CON L’ANTICA VIA CLODIA VERSO SAN MICHELE, UN CAMMINO DI CAMMINI, http://www.anticaviaclodia.it/