During the age of Emperor Augustus, Carsulae became a Roman "municipium". During his reign a number of major works were initiated, eventually including the amphitheater, most of the forum, and the marble-clad Arch of Trajan (now called the Arco di San Damiano). During its "golden age" Carsulae, supported by agricultural activity in the surrounding area, was prosperous and wealthy. Its bucolic setting, its large complex of mineralized thermal baths, theaters, temples and other public amenities, attracted wealthy and even middle class "tourists" from Rome.