A scientific theory is what you are talking about.
The pair of leaders that used political purges including the killing of opposition groups as a means of maintaining control of the government were Joseph Stalin and Mao Zedong. Stalin was the communist leader in Russia and Mao Zedong was another communist leader from the country of china. I hope it helps you.
If you ask about the early Christian mosaics - the saints were usually presented on a golden background. For example in the St. Catherine's Monastery from 6th century in Egypt, all the Saints, and Jesus were all presented on a golden background
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Answer:
North Eastern Asia
Explanation:
It is between China and Mongolia