How long was the rule of the dynasty that was active when the Rosetta Stone was inscribed?
Rosetta Stone The Rosetta Stone is a granodiorite stele, found in 1799, inscribed with three versions of a decree issued at Memphis, Egypt in 196 BC during the Ptolemaic dynasty on behalf of King Ptolemy V. The top and middle texts are in Ancient Egyptian using hieroglyphic script and Demotic script, respectively, while the bottom is in Ancient Greek. As the decree has only minor differences between the three versions, the Rosetta Stone proved to be the key to deciphering Egyptian hieroglyphs.
Amarna Period The Amarna Period was an era of Egyptian history during the latter half of the Eighteenth Dynasty when the royal residence of the pharaoh and his queen was shifted to Akhetaten ('Horizon of the Aten') in what is now Amarna. It was marked by the reign of Amenhotep IV, who changed his name to Akhenaten (1353–1336 BC) in order to reflect the dramatic change of Egypt's polytheistic religion into one where the sun disc Aten was worshipped over all other gods. Aten was not solely worshipped (the religion was not monotheistic), but the other gods were worshipped to a significantly lesser degree. The Egyptian pantheon of the equality of all gods and goddesses was restored under Akhenaten's successor, Tutankhamun.