'However, you may not know some of the most basics facts about the object. For instance, what was its purpose, and what did it actually say? In this video, Ilona Regulski, curator of Egyptian written culture at the British Museum in London, walks viewers through the stone and its ‘decree’, issued during the Ptolemaic dynasty in 196 BCE.'

https://aeon.co/videos/what-did-the-rosetta-stones-inscription-actually-communicate