Here's a website that lists important emperors I'm not sure which one you need.
I hope this helps :) http://www.ducksters.com/history/mesopotamia/famous_rulers_of_ancient_mesopotamia.php
Answer: Winston CHurchill, Stalin, Roosevelt
Explanation:
The big 3 met many times and discussed the progression of the countries post-ww2. They sacrificed "freedom for stability" although the tensions between churchill and roosevelt somewhat ensured the ensuing of a later cold war
You are right you got the right answer