Rosetta Stone

The Rosetta Stone is a granodiorite stele, found in 1799, inscribed with three versions of a decree issued at Memphis, Egypt in 196 BC during the Ptolemaic dynasty on behalf of King Ptolemy V. The top and middle texts are in Ancient Egyptian using hieroglyphic script and Demotic script, respectively, while the bottom is in Ancient Greek. As the decree is the same (with some minor differences) in all three versions, the Rosetta Stone proved to be the key to deciphering Egyptian hieroglyphs.
Ver en Wikipedia.org