The Louvre Museum is one of the world's largest museums, the most visited art museum in the world, and a historic monument. The Egyptian antiquities department, comprising over 50,000 pieces, includes artifacts from the Nile civilizations which date from 4,000 BC to the 4th century AD. The collection, among the world's largest, overviews Egyptian life spanning ancient Egypt, the Middle Kingdom, the New Kingdom, Coptic art, and the Roman, Ptolemaic, and Byzantine periods. The department's origins lie in the royal collection, but it was augmented by Napoleon's 1798 expeditionary trip with Dominique Vivant, the future director of the Louvre. After Jean-François Champollion translated the Rosetta Stone, Charles X decreed that an Egyptian Antiquities department be created. Champollion advised the purchase of three collections, the Durand, Salt and Drovetti; these additions added 7,000 works. Growth continued via acquisitions by Auguste Mariette, founder of the Egyptian Museum in Cairo. Mariette, after excavations at Memphis, sent back crates of archaeological finds including The Seated Scribe.