Rosetta Stone

The Rosetta Stone is a stone found by Napoleon on his expedition in Egypt which had three writings including Greek, Demotic, and Hieroglyphic. It used three languages because the hieroglyphs were religious, Demotic was the common script of Egypt, and Greek was the language of the rulers at the time. It was carved i n196BC and found in 1799. With this discovery they were able to translate the hieroglyphs and solve the lifelong mystery of what the tombs were saying. It is currently on display at the British Museum of art.

http://www.ancientegypt.co.uk/writing/rosetta.html