Rosetta Stone

The Rosetta Stone is a granodiorite stele inscribed with a decree issued in Memphis on behalf of King Ptolemy V in 196 BCE. It was discovered by a soldier,, during Napoleon Bonaparte's expedition to Egypt. The text was deciphered by Jean-François Champollion, which provided the key to understanding Egyptian hieroglyphics.

The Templars procured a rubbed transfer of the missing section of the Rosetta Stone. Champollion, an ally of the Assassin Brotherhood, that the rubbing contained sensitive information concerning the Assassins. The Assassin Council tasked Arno Dorian with recover the pieces of the rubbing, with the aid of Champollion.

Reference

 * Assassin's Creed: Unity