Septimius Severus and Caracalla have been found on the premises). Zenobia, the deposed queen of Palmyra, lived near the villa from 273 until her passing. The villa was restored by Diocletian during the final decades of the third century. During the decline of the Roman Empire in the 4th century, the villa gradually fell into disuse and was partially ruined as valuable statues and marble were taken away by Constantine the Great and his successors. The facility was used as a warehouse by both sides during the destructive Gothic War (535–554) between the Ostrogoths and Byzantines. Remains of lime kilns have been found, where marble from the complex was burned to extract lime for building material. Building material was also reused by the Christians to build basilicas and other buildings. The first documented rediscovery of the Villa was by Historian Biondo Flavio in the late 15th century who brought its attention to Pope Pius II whose writings on the villa in his Comeratti began to pique architectural interest in the Villa. In the 16th century, Cardinal Ippolito II d'Este had much of the remaining marble and statues in Hadrian's Villa removed to decorate his own Villa d'Este located nearby. Since that period, excavations have sporadically turned up more fragments and sculptures, some of which have been kept in situ or housed on site in the display buildings. Structure and architecture Hadrian's Villa is a vast area of land with many pools, baths, fountains and classical Greek and Roman architecture set in what would have been a mixture of landscaped gardens, wilderness areas and cultivated farmlands. Due to Hadrian's travels, he also commissioned Egyptian style buildings and statues, even naming some of the buildings after Egyptian cities or temples. The buildings are constructed in travertine, brick, lime, pozzolana, and tufa. The complex contains over 30 buildings, covering at least a square kilometre (250 acres, an area larger than the city of Pompeii), of which much is still unexcavated. Villas were typically sited on hilltops, but with its fountains, pools and gardens, Hadrian's villa required abundant sources of water, which was supplied by aqueducts feeding Rome, including the Aqua Anio Vetus, Aqua Anio Novus, Aqua Marcia, and Aqua Claudia. To avail themselves of those sources, the villa had to be located on land lower than the aqueduct. The complex of the villa contains many structures from different cultures. For example, the villa