In mid-July 1799, French soldiers strengthening the defences of Fort Julien, near the town of Rashid —Rosetta to Europeans— in the Nile Delta, dug up a dark slab covered in inscriptions. The engineering officer in charge, Pierre-François Bouchard, saw at once that this was no ordinary piece of rubble: the stone carried three distinct blocks of writing, and the bottom one was Greek, a language any educated person could read. If the three texts said the same thing, that slab was a key.
What they had found was a fragment of a granodiorite stela bearing a decree issued at Memphis by a council of priests on 27 March 196 BC, in honour of Ptolemy V Epiphanes, a pharaoh who had inherited the throne at the age of five and had just been officially crowned at twelve. The content is rather bureaucratic —honours for the king, tax concessions for the temples— but the format proved revolutionary for those who unearthed it two thousand years later: the same text appears in hieroglyphs, the "writing of the gods" reserved for the priesthood; in Demotic, Egypt's everyday administrative script; and in Greek, the language of the Ptolemaic dynasty. The decree itself orders that a copy in this triple form be set up in every temple in the land. In other words, the Rosetta Stone is an official translation carved in stone, complete with explicit instructions for its distribution.
The stone spent barely two years in French hands. After the capitulation of Alexandria in 1801 it passed to the British, along with other antiquities gathered by Napoleon's expedition, and in February 1802 it landed at Portsmouth aboard HMS Égyptienne. It has been on display at the British Museum since that same year, and remains the museum's most visited object. Before handing it over, however, the French scholars had made copies and prints of the inscriptions, so the text travelled across Europe even though the stone stayed put: the decipherment would be a continental race.
The Greek was read quickly; the trouble lay with the hieroglyphs, of which only the last fourteen lines survive on the slab, and which Europe had spent centuries misreading as purely allegorical symbols with no connection to sound. The first serious blow came from the British polymath Thomas Young, who between 1814 and 1819 picked apart the Demotic text and showed that the signs enclosed in cartouches —the ovals framing royal names— spelled out the name Ptolemy phonetically. But it was the Frenchman Jean-François Champollion, fluent in Coptic, the final stage of the Egyptian language, who crossed the decisive frontier. Comparing the cartouche of Ptolemy with that of Cleopatra, copied from an obelisk from Philae that William Bankes had shipped to England, he confirmed that the signs shared by both names sat exactly where they should: hieroglyphs had letters. On 14 September 1822, so the family story goes, he burst into his brother's study shouting "Je tiens l'affaire!" —"I've got it!"— and on 27 September he presented his findings to the Académie des Inscriptions et Belles-Lettres in the celebrated Lettre à M. Dacier, the birth certificate of Egyptology. His core insight: Egyptian writing combined phonetic signs with ideograms, and Coptic supplied the sound and the sense.
What opened up then was not a display case but a civilisation. Three thousand years of hymns, contracts, private letters and royal chronicles had gone more than a millennium without a single reader anywhere on earth; from 1822 onwards they had a voice again. All thanks to an administrative document polite enough to repeat itself in three scripts.
From that slab to today
The Rosetta Stone holds a lesson time has not worn down: without translation there is no access. A text nobody can read is, for all practical purposes, a text that does not exist. And there is something more, almost a wink across the centuries: the Memphis decree worked because its three versions carried identical weight, because whoever read one could trust it said the same as the others. That guaranteed equivalence is still the sworn translator's trade today: certifying that a document and its translation are, in the eyes of whoever reads them, the same text.