<human>:  What is the history of the Rosetta Stone?
<bot>: The Rosetta Stone is a granodiorite stele inscribed with three versions of a decree issued in 196 BC, during the Ptolemaic dynasty of Egypt. It is written in two languages, Egyptian hieroglyphs and Ancient Greek, and documents a decree from Ptolemy V, the fifth Ptolemaic pharaoh. The decree concerns the temple of Ptah, the god of Memphis, and acknowledges the establishment of a cult for the divine ruler. The Rosetta Stone is the key to understanding the history and culture of ancient Egypt, as the hieroglyphic script used to write the inscription was lost for nearly 2000 years until it was deciphered by Jean-François Champollion in 1822.