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
Religion in the Mongol Empire Holy Land. Ilkhan Abacha sent a tumen to support crusaders during the Ninth Crusade in 1271. The Nestorian Mongol Rabban Bar Sauma visited some European courts in 1287-1288. At the same time, however, Islam began to take firm root amongst the Mongols, as those who embraced Christianity such as Tekuder, became Muslim. After Ongud Mar Yahbh-Allaha, the monk of Kublai Khan, was elected a catholicos of the eastern Christian church in 1281, Catholic missionaries were begun to be sent to all Mongol capitals. The Ilkhanate, Golden Horde, and the Chagatai Khanate - three of the four principal khanates (except for