lives of these workers are quite well known due to their being recorded in tombs and official documents. Amongst the events documented is perhaps the first recorded workers' strike, detailed in the Turin Strike Papyrus. Exploration of the valley The valley has been a major focus of modern Egyptological exploration for the last two centuries. Prior to this time, it was a site for tourism in antiquity (especially during Roman times). The area illustrates the changes in the study of ancient Egypt, starting as antiquity hunting, and ending as scientific excavation of the whole Theban Necropolis. Despite the exploration and investigation noted below, only eleven of the tombs have actually been completely recorded. Many of the tombs have graffiti written by those ancient tourists. Jules Baillet has located over 2,100 Greek and Latin instances of graffiti, along with a smaller number in Phoenician, Cypriot, Lycian, Coptic, and other languages. The majority of the ancient graffiti is found in KV9, which contains just under a thousand of them. The earliest positively dated graffiti dates to 278 B.C. In 1799, members of Napoleon's expedition to Egypt (especially Vivant Denon) drew maps and plans of the known tombs, and for the first time noted the Western Valley (where Prosper Jollois and Édouard de Villiers du Terrage located the tomb of Amenhotep III, WV22). The Description de l'Égypte contains two volumes (out of a total of 24) on the area around Thebes. European exploration continued in the area around Thebes during the nineteenth century. Early in the century, the area was visited by Giovanni Belzoni, working for Henry Salt, who discovered several tombs, including those of Ay in the West Valley (WV23) in 1816 and Seti I (KV17) the following year. At the end of his visits, Belzoni declared that all of the tombs had been located and nothing of note remained to be found. Working at the same time was Bernardino Drovetti, the French Consul-General and a great rival of Belzoni and Salt. John Gardner Wilkinson, who lived in Egypt from 1821 to 1832, copied many of the inscriptions and artwork in the tombs that were open at the time. The decipherment of hieroglyphs, though still incomplete during Wilkinson's stay in the valley, enabled him to assemble a chronology of New Kingdom rulers based on the inscriptions in the tombs. He also established the system of tomb numbering that has been in use,