R. Dunkerly, in Resource, No. 2
In 1269 Kublai Khan sent a request from Peking to Rome for "a hundred wise men of the Christian religion...And so I shall be baptized, and when I shall be baptized all my baron and great men will be baptized, and their subjects baptized, and so there will be more Christians here than there are in your parts."
The Mongols were then wavering in the choice of a religion. It might have been, as Kublai forecast, the greatest mass religious movement the world has ever seen. The history of all Asia would have been changed. But what actually happened? Pope Gregory X answered by sending two Dominican friars. They got as far as Armenia, could endure no longer and returned home. So passed the great missionary opportunity in the history of the church.