What’s a group that had power in the dark ages/Middle Ages and what did they control?

dark ages

Explanation:

why because they have so much money and power in there hand. And Middle Ages not have money and not there have power on there hand and they went to jobs and working and earning money to pay the rent to they owner and there live happily and a look good and happy family

each played a major role in ending the cold war.

these civilizations were located around fertile rivers, where they could produce an abundance of crops