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Primary sourceLetter13 March 1245

Cum non solum

Pope Innocent IV · 13 March 1245

A 1245 papal letter to the Mongols, answered by Genghis Khan's grandson Güyük Khan with a sealed reply demanding submission to Mongol rule.

The reply by Genghis Khan's grandson Güyük Khan echoes the claim to divinely granted world rule that Genghis had founded his empire on.

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Red impression of a seal in vertical columns of stylized, angular Mongolian-script characters on a white background, with a red frame border along the edges.
Seal of Güyük Khan in classical Mongolian script, from his 1246 reply to Pope Innocent IV.

About this source

What it is

Pope Innocent IV wrote this letter in 1245, urging the Mongols to stop attacking Christians and asking about their future intentions. It was carried by the Franciscan friar John of Plano Carpini to the Mongol capital Karakorum, where he witnessed the election of Güyük Khan in 1246. Güyük, grandson of Genghis Khan, sent back a reply in Persian with a Turkic preamble, sealed with a Mongolian-script seal, demanding the Pope's submission.

Why it matters

Güyük's reply claims that Heaven granted the Mongols rule over the world, an idea rooted in the ideology Genghis Khan had used to justify his conquests. The exchange shows how European powers tried to negotiate with the Mongol Empire, and how Genghis Khan's successors continued to assert the same claim to universal authority he had established.

Look closer

  • Why might the Pope and the Khan have completely different understandings of the word "peace"?
  • What does Güyük's demand for submission tell you about how the Mongols saw their own power in the world?
  • What might the choice of languages and the seal on Güyük's reply tell you about the Mongol court's view of its own authority?

This letter is part of the curated material that grounds the AI version of Genghis Khan on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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