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Ancient Pompeii graffito caricature of a politician. Villa of the Mysteries.
https://ro.wikipedia.org/wiki/Graffiti#/media/Fi%C8%99ier:Graffiti_politique_de_Pompei.jpg
Many people think that Graffiti is a modern artistic manifestation (many think it is not even artistic). But the phenomenon is very old, it is found in many places since antiquity, even from the Neolithic.