Kublai Khan's language would be Mongolian
It is also possible that he spoke Chinese as well.

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Kublai or Khubilai Khan (September 23, 12151 – February 18, 12942) (Mongolian: Хубилай хаан; Chinese: 忽必烈), was the fifth Great Khan of the Mongol Empire from 1260 to 1294 and the founder of the Yuan Dynasty. As the second son of Tolui and Sorghaghtani Beki and a grandson of Genghis Khan, he claimed the title of Khagan of the Ikh Mongol Uls (Mongol Empire) in 1260 after the death of his older brother Möngke in the previous year
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information obtain from http://en.wikipedia.org/wiki/Kublai_Khan

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The Yuan Dynasty (Chinese: 元朝; pinyin: Yuáncháo; Mongolian: Dai Ön Ulus/Дай Юан Улс), or Great Yuan Empire (simplified Chinese: 大元帝国; traditional Chinese: 大元帝國; pinyin: Dà Yuán Dìguóneeded) was both the continuation of the Mongol Empire and the Mongol founded historical state in Mongolia and China1, lasting officially from 12712 to 13683.
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information obtain from http://en.wikipedia.org/wiki/Yuan_Dynasty

Languages use during the Yuan Dynasty where Mongolian and Chinese the website varies that both languages where use. http://en.wikipedia.org/wiki/Yuan_Dynasty
Source(s):
http://en.wikipedia.org/wiki/Yuan_Dynasty

http://en.wikipedia.org/wiki/Kublai_Khan

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