The Rosetta Stone is found

French soldiers digging foundations for a fort near Rashid, which they called Rosetta, found a broken slab built into an old wall, carrying one decree in three scripts.

The decree, from 196 BC, affirms the royal cult of the 13-year-old Ptolemy V, in hieroglyphs, Demotic and Ancient Greek. Scholars could still read the Greek, and in 1822 Champollion announced the step that let hieroglyphs be read again. The British Museum says accounts of the find are vague: 15 July 1799 is the date most generally accepted, and it is the date the Moon here is computed for.