If "media" refers to a means of communicating information, then the Rosetta stone (pictured above) -- a slab more than 2,000 years old engraved with a decree about Pharaoh Ptolemy V, and the key artifact that allowed modern scholars to decipher Egyptian hieroglyphics -- is arguably the world's most important ancient media.
HISTORY's Moments in Media: Reading the Rosetta Stone -- The World's Most Important Ancient Media
