If the creators of the game want to label the Celts (who have been called by traditional historians as "uncultured savages") and the Mongols (of which no historian would call and actual civilization) as civilizations then why not some Civilization.
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The Celts were incredibly advanced for their time, it was only after their conquest by the romans that they became defunct as an actual civilization. I bet you didn't know that the celts invented chainmail, did you? yes, chainmail, the armor that became a staple of war for thousands of years afterward. They also were very skilled with bronzeworking, and influenced the roman metalwork-art. They DEFINITELY deserve to be a civilization.
And the mongols? don't make me laugh.
The mongols:
- invented paper currency
- had a "pony express" system that could span 1000 miles in a few days
- used the most advanced military tactics of the time
- had the largest empire in history
- opened the trade routes from east to west, thus encouraging the age of exploration
- created kingdoms that lasted until the 1700s