Who deciphered the Rosetta Stone?

The
Rosetta Stone is a piece of black basalt found in Egypt with an identical message carved in
three different languages. It was approximately two-and-a-half feet wide and four feet long.
Carved in 196 BC, the text is written in hieroglyphic (the script used by Egyptian priests for
religious purposes), demotic (the language that common Egyptians used), and ancient
Greek.

The Rosetta Stone...

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