Are Ancient Civilizations (i.e. Greeks and Romans) aware of the existence of more Ancient civilizations (i.e. Mesopotamians et. al)? If so, how?

by UnnecessaryMovements
gdj11

I asked a similar question about two years ago and the answers might be of interest to you: https://www.reddit.com/r/AskHistorians/comments/m66sa9/what_did_ancient_cultures_consider_to_be_ancient/