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 the Levant Tekuder's conversion to Islam and attempts to make peace with the Mamluks were not popular with the other nobles of the Ilkhanate. When Tekuder's brother Arghun challenged him for the throne, Tekuder sought assistance in vain from the Mamluks, but was executed. Arghun (1284–91) took power, and as directed by the Great Khan Kublai (r.1260-94) continued Mongol attempts to conquer Syria. In late 1299, the Mongol Ilkhan Mahmud Ghazan, son of Arghun, took his army and crossed the Euphrates river to again invade Syria. They continued south until they were slightly north of Homs, and successfully took Aleppo. There, Ghazan