Friday, July 9, 1999 Published at 09:44 GMT 10:44 UK
Decoding the mysteries of ancient Egypt
Painting from the tomb chapel of Nebamen (c. 1390 BC)
Two hundred years ago the world's most famous piece of rock was discovered on the muddy banks of the Nile.
To celebrate its bicentenary the British Museum opens a new exhibition "Cracking Codes: The Rosetta Stone and Decipherment" on Saturday 10 July.
Dr Richard Parkinson of the British Museum's Department of Antiquities says the stone is the museum most popular attraction.
"It was carved in 196 BC in two languages, Greek and Ancient Egyptian and it allowed people to read ancient Egyptian hieroglyphics for the first time in over 1,000 years.
It was the multicultural nature of Egyptian society that led to the stone being inscribed in two different languages. But despite this cracking the code on the stone was a "hideously complicated affair" according to Dr Parkinson.
But when it was cracked the subject of the text was "one of the great disappointments" according the Dr Parkinson.
"Everyone was expecting the hieroglyphics to be mystical symbolic pictures, whereas in actual fact they are fairly efficient, fairly normal writing system."
The stone is actually a decree issued by the priests of Egypt in favour of the Greek born King Of Egypt Ptolemy and among other things details rather mundane tax concessions.
It is now the centrepiece of the Museum's new exhibition.
The Rosetta Stone helped to unlock Egyptian culture and not only for those in the academic world.
The cinema has long loved a good epic and the 1955 Hollywood film The Egyptian was based on an ancient Egyptian poem. Currently the movie blockbuster The Mummy is attracting large audiences.
Perhaps surprisingly Dr Parkinson is a fan too. He says he thinks The Mummy is "good fun".
"It's not outstandingly accurate in details, but I've really got to approve of the fact that it makes the ability to read hieroglyphics of crucial importance. I think from that point of view the plot is very good."
Cracking Codes: The Rosetta Stone and Decipherment runs from 10 July - 16 January at the British Museum.