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What is the plausibility of one of the various nomadic people kicking around the Pontic Steppe at some point in the Middle Ages subjugating the other nomadic peoples going on a conquering spree across the Middle East and Central and Eastern Europe and expanding Eastward and taking part or all of China at their height i.e. pulling off the sort of conquests the Mongol did but going from the West to the East.
Would the Cuman-Kipchaks be a likely candidate for this given their size and geopolitical position?