a library of a mainly philosophical character. It is believed that the library might have been collected and selected by Piso's family friend and client, the Epicurean Philodemus of Gadara, although this conclusion is not certain. Followers of Epicurus studied the teachings of this moral and natural philosopher. This philosophy taught that man is mortal, that the cosmos is the result of accident, that there is no providential god, and that the criteria of a good life are pleasure and temperance. Philodemus' connections with Piso brought him an opportunity to influence the young students of Greek literature and philosophy who gathered around him at Herculaneum and Naples. Much of his work was discovered in about a thousand papyrus rolls in the philosophical library recovered at Herculaneum. Although his prose work is detailed in the strung-out, non-periodic style typical of Hellenistic Greek prose before the revival of the Attic style after Cicero, Philodemus surpassed the average literary standard to which most epicureans aspired. Philodemus succeeded in influencing the most learned and distinguished Romans of his age. None of his prose work was known until the rolls of papyri were discovered among the ruins of the Villa of the Papyri. At the time of the eruption of Vesuvius in AD 79, the valuable library was packed in cases ready to be moved to safety when it was overtaken by a pyroclastic flow; the eruption eventually deposited some 20–25 m of volcanic ash over the site, charring the scrolls but preserving them – the only surviving library of Antiquity – as the ash hardened to form tuff. Excavations The House of Bourbon under King Charles VII of Naples issued excavations following the re-discovery of Herculaneum in 1738. Excavation work at Herculaneum was done through digging tunnels, and piercing walls, in an attempt to find treasures like paintings, statues and other ornaments to be exhibited in the Museum Herculanense, part of the King's Royal Palace in Portici. The Villa of the Papyri was discovered in 1750 by farmers when digging a well. The following excavation work was conducted first by Roque Joaquín de Alcubierre and later by the Swiss engineer Karl Jakob Weber, who worked under Alcubierre for King Charles VII of Naples. Initially the first papyri scrolls which were obtained in 1752 were thrown away due to the high number, then Bernardo Tanucci advised the King to study them. The King subsequently established