Secret letters between the Popes and Mongols
One of the weirdest diplomatic exchanges in history was between the medieval Popes and the invading Mongols from the east. Rome hoped it could convince these fearsome tribes not to attack Christians – and maybe even convert to Roman Catholicism. The Mongols responded with demands that the pope submit to their power. Incredibly, some of the letters from the Mongol khans have been kept in the Vatican Secret Archives for eight hundred years.

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