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In the OT some Mongols were converted to Nestorianism a type of Eastern Orthodox. In the 1200's the Latin Church sent several missions to the Mongols with low result.
WI: The Catholic missionaries in the 1200's had a better result and picked up on the existing trend of Nestorianism. How would the history of Asia be different if the Mongols converted in large numbers. This could have been percipitated by the conversion of a high ranking Mongol and so forth.