The Aqua Anio Novus, begun by Caligula in 38 AD and later completed by Claudius, was one of the aquaeducts on which the city's water supply depended. It took its name from carrying water from the Anio river into the city, the addage of 'Novus' to its name was to distinguish it from the Aqua Anio 'Vetus', the 'elder' viaduct which already brought water from Anio river.
