Which civilization would you replace the Atlanteans with?

Since the Atlanteans are a fictional culture which is a mishmash of ancient Roman, Mesoamerican and other cultures it sticks out like a sore thumb compared to the other 4 playable civilizations. Definitely wanna hear the community's opinions about this. Which real world historical culture would you replace them with if possible? However, before commenting please keep in mind these 4 conditions.

1-The Chinese should stay but be rebuild from the ground up and made better.

2-The Aztecs/Mayans should be added as a sixth civilization in a DE, because they are aesthetically different and heavily requested by fans so mentioning them isn't an option during this question.

3-The 3 base cultures (Greek-Egyptian-Norse) would stay in the game untouched.

4-The culture must be a real historical one which existed (therefore no things like Hyperborea, Lemuria, Cthulhu Mythos, etc) and if possible be distinct from the other 5 playable civilizations.