The Rosetta Stone
The Rosetta Stone is an Ptolemaic-era Egyptian artifact which provided the key to a modern understanding of Egyptian hieroglyphs. It is inscribed with a decree issued by King Ptolemy V in 196 BCE, with the decree is inscribed in three Hieroglyphs, Demotic script (a post-Late Egyptian, pre-Greek language spoken in Egypt beginning in 650 BCE), and Ancient Greek. The same text is presented in all three languages, thus scholars were able to decipher the Hieroglyph text through their knowledge of Ancient Greek.
close-up of panels inscribed in each of the three languages
As time went on, the stele, which was probably a fairly ordinary one at the time of its issue, eventually ended up in use as a building material in the construction of Fort Julien on the Nile River Delta. A French soldier found the stele in 1799, and recognized its value to Western scholarship. As it was not being used in any academic or official propensity, he took it.
Word spread quite rapidly of this find, and lithographic copies and plaster casts of the stele began to circulate around the European scholarly community.
However, as this was taking place to the backdrop of the Napoleonic wars, in 1801, British troops attacked and defeated the French troops stationed in Egypt. The British took the Rosetta Stone from the French in a move sanctioned by the Treaty of Alexandria, and its subsequent removal from Egyptian soil was approved by the Ottoman government. It has been on display at the British Museum since 1802.
In July of 2003, Egypt made its first request for the repatriation of the Rosetta Stone.