Mongol Empire What is referred to in English as the Mongol Empire was called the "Ikh Mongol Uls" ("ikh": "great", "uls": "state"; Great Mongolian State). In the 1240s, one of Genghis's descendants, Güyük Khan, wrote a letter to Pope Innocent IV which used the preamble "Dalai (great/oceanic) Khagan of the great Mongolian state (ulus)". After the succession war between Kublai Khan and his brother Ariq Böke, Ariq limited Kublai's power to the eastern part of the empire. Kublai officially issued an imperial edict on 18 December 1271 to name the country Great Yuan ("Dai Yuan", or "Dai Ön Ulus") to establish the
Mongol invasions of Tibet to station in Tibet in 1254-55 possibly to suppress war-like tribes in Tibet. Hulegu appointed his representative, Kokochu, in Tibet in mid-1250s while marching towards Iran. Since then, the Ilkhans had had possessions in Tibet. In 1265 Qongridar ravaged the Tufan/mDo-smad area, and from 1264 to 1275 several campaigns pacified the Tibetan and Yi peoples of Xifan around modern Xichang. By 1278 Mongol myriarchies: tumens and postroads reached through mDo-khams as far west as Litang. Tibet was subdued to the Mongol Empire under Mongolian administrative rule, but the region was granted with a degree of political autonomy. Kublai Khan would