Table on hieroglyphics research. Table from the 1822 booklet published by French Egyptologist Jean-Francois Champollion (1790-1832). In this booklet ('Lettre a M. Dacier') Champollion described the key breakthrough that enabled him to decipher the hieroglyphics used in Ancient Egypt. Discovered by Napoleon's army in 1799 in Rashid (Rosetta) in Egypt, the Rosetta Stone's three parallel languages (everyday script [demotic], Greek, and hieroglyphics) allowed researchers to decode hieroglyphics. The table's columns show (left to right) the phonetic equivalents for: Greek letters, demotic signs, and hieroglyphic signs.