The fountain at the junction of three roads (tre vie)[2] marks the terminal point[3] of the "modern" Acqua Vergine, the revived Aqua Virgo, one of the aqueducts that supplied water to ancient Rome. In 19 BC, supposedly with the help of a virgin, Roman technicians located a source of pure water some 13 km (8.1 mi) from the city. (This scene is presented on the present fountain's façade.) However, the eventual indirect route of the aqueduct made its length some 22 km (14 mi). This Aqua Virgo led the water into the Baths of Agrippa. It served Rome for more than 400 years.[4]

Legend holds that in 19 BC thirsty Roman soldiers were guided by a young girl to a source of pure water thirteen kilometres (8.1 miles) from the city of Rome. The discovery of the source led Augustus to commission the construction of a twenty-two-kilometre (14-mile) aqueduct leading into the city, which was named Aqua Virgo, or Virgin Waters, in honour of the legendary young girl. The aqueduct served the hot Baths of Agrippa, and Rome, for over four hundred years.