Rosetta Stone decree

The Rosetta Stone decree, or the Decree of Memphis, is a Ptolemaic decree most notable for its bilingual and tri-scriptual nature, which enabled the decipherment of Egyptian hieroglyphs. Issued by a council of priests confirming the royal cult of Ptolemy V in 196 BC at Memphis, it was written in Egyptian hieroglyphs, Egyptian Demotic and Ancient Greek. It mentions the Egyptian rebellion against the Greek rulers, otherwise known only through Greek sources and remains of graffiti.