In the 5th and 6th centuries, the villa was fortified for defensive purposes by thickening the perimeter walls and closing of the arcades of the aqueduct to the baths. The villa was damaged and perhaps destroyed during the short domination of the Vandals between 469–78. The outbuildings remained in use, at least in part, during the Byzantine and Arab periods. The settlement was destroyed in 1160-1 during the reign of William I. The site was abandoned in the 12th century AD after a landslide covered the villa. Survivors moved to the current location of Piazza Armerina. The villa was almost entirely forgotten, although some of the tallest parts of the remains were always visible above ground. The area was cultivated for crops. Early in the 19th century, pieces of mosaics and some columns were found. The first official archaeological excavations were carried out later in that century. The first professional excavations were made by Paolo Orsi in 1929, followed by the work of Giuseppe Cultrera in 1935–39. Major excavations took place in the period 1950–60 led by Gino Vinicio Gentili, after which a protective cover was built over the mosaics. In the 1970s Andrea Carandini carried out excavations at the site. Work has continued to the present day by the University of Rome, La Sapienza. In 2004 a large mediaeval settlement of the 10–12th centuries was found. Since then further sumptuous rooms of the villa have also been revealed. In late antiquity the Romans partitioned most of the Sicilian hinterland into huge agricultural estates called "latifundia". The villa's latifundium is cited in the Itinerarium Antonini and is known as the Filosofiana. The villa’s "pars rustica", or agricultural section, has been discovered to the west of the entrance area, as shown by a room divided in three parts by pillars for storage of agricultural products. The size of the villa and the amount and quality of its artwork indicate that it was the "pars dominica" of such a latifundium. The villa was so large as to include multiple reception and state rooms, which reflects the need to satisfy a number of different functions and to include spaces for the management of the estate as well as of the villa. This transformed the villa into a city in miniature. The villa would likely have been the permanent or semi-permanent residence of the owner; it would have been where the owner, in his role as patron, received his local clients.