The villa Pausilypon is situated on the Bay of Naples and represents one of the few examples of its kind, that can clearly be assigned to the Roman emperors for a period of at least one and a half centuries. For the first time since the earliest excavations in 1841, it was possible to link all available sources to a reliable plan of the site, which covers approximately 15 acres. Furthermore, a precise documentation of the building remains on the upper terrace was produced, which served as basis for studies regarding the design and construction process, architectural forms and phases of conversion.