The Rosetta Stone has the same inscription written in three languages; Ancient Egyptian hieroglyphs, Demotic, and Greek. Its discovery in 1799 was key to figuring out the hieroglyphic writing system, thus allowing modern historians to unlock the contents of many manuscripts and carvings that were previously unknown. The Rosetta Stone is currently located in the British Museum.
The French Revolution was replaced by The French Republic during a period of horrific political violence known as the Reign of Terror. Thousands of nobles and priests were slaughtered or sent to the guillotine. Much of this was under the orders of the ironically titled Committee of Public Safety.