DURING MASS ONE DAY in the winter of 1287–1288, King Edward I of England rose up from his throne to stand in honor of Rabban Bar Sawma, the newly arrived envoy from the Mongol Emperor Khubilai Khan. When he reached the court of the English king, Rabban Bar Sawma had probably traveled farther than any official envoy in history, covering some seven thousand miles on the circuitous land route from the Mongol capital, through the major cities of the Middle East, and on to the capitals of Europe. King Edward stood before the envoy not to offer submission to the Mongol Khan, but to accept bread from
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