The Mongol Empire (Mongolian: Mongol-yn Ezent Güren About this sound listen (help·info); Mongolian Cyrillic: Монголын эзэнт гүрэн; also Орда ("Horde") in Russian chronicles), which existed during the 13th and 14th centuries, was the largest contiguous land empire in history. Beginning in the Central Asian steppes, it eventually stretched from Central Europe to the Sea of Japan, extending northwards into Siberia, eastwards and southwards into the Indian subcontinent, Indochina, and the Iranian plateau, and westwards as far as the Levant and Arabia. The empire unified Mongol and Turkic tribes of historical Mongolia under the leadership of Genghis Khan, who was proclaimed ruler of all Mongols in 1206. The empire grew rapidly under his rule and then under his descendants, who sent invasions in every direction. The vast transcontinental empire connected the east with the west with an enforced Pax Mongolica allowing trade, technologies, commodities, and ideologies to be disseminated and exchanged across Eurasia. Mongol conquests resulted in some of the most destructive wars in human history. In Iran, the Mongol invasion resulted in extermination, disease, and destruction of irrigation systems resulting in mass emigration, famine, and drastic population decline. Historian Steve Ward estimates that three quarters of the population, about 10 to 15 million people, died, and that Iran's population did not reach its pre-Mongol levels again until the 20th century. The empire began to split due to wars over succession, as the grandchildren of Genghis Khan disputed whether the royal line should follow from his son and initial heir Ögedei, or one of his other sons such as Tolui, Chagatai, or Jochi. The Toluids prevailed after a bloody purge of Ögedeid and Chagataid factions, but disputes continued even among the descendants of Tolui. After Möngke Khan died, rival kurultai councils simultaneously elected different successors, the brothers Ariq Böke and Kublai Khan, who then not only fought each other in the Toluid Civil War, but also dealt with challenges from descendants of other sons of Genghis. Kublai successfully took power, but civil war ensued as Kublai sought unsuccessfully to regain control of the Chagatayid and Ögedeid families. The Battle of Ain Jalut in 1260 marked the high-water point of the Mongol conquests and was the first time a Mongol advance had ever been beaten back in direct combat on the battlefield. Though the Mongols launched many more invasions into the Levant, briefly occupying it and raiding as far as Gaza after a decisive victory at the Battle of Wadi al-Khazandar in 1299, they withdrew due to various geopolitical factors. By the time of Kublai's death in 1294, the Mongol Empire had fractured into four separate khanates or empires, each pursuing its own separate interests and objectives: the Golden Horde khanate in the northwest; the Chagatai Khanate in the west; the Ilkhanate in the southwest; and the Yuan Dynasty based in modern-day Beijing. In 1304, the three western khanates briefly accepted the nominal suzerainty of the Yuan Dynasty, but when it was overthrown by the Han Chinese Ming Dynasty in 1368, the Mongol Empire finally dissolved. What is referred to in English as the Mongol Empire was called the Ikh Mongol Uls (ikh: great, uls: state; Great Mongol State). In the 1240s, Genghis's descendant Güyük Khan wrote a letter to Pope Innocent IV which used the preamble, "Dalai (great/oceanic) Khagan of the great Mongol state (ulus)". After the succession war between Kublai Khan and his brother Ariq Böke, Ariq limited Kublai's real power to the eastern part of the empire. Kublai officially issued an imperial edict on December 18, 1271 to name the country "Great Yuan" (Dai Yuan, or Dai Ön Ulus) to establish the Yuan Dynasty. Some sources state that the full Mongolian name was Dai Ön Yehe Monggul Ulus. The area around Mongolia, Manchuria, and parts of North China had been controlled by the Liao Dynasty since the 10th century. In 1125, the Jin Dynasty founded by the Jurchens overthrew the Liao Dynasty and attempted to gain control over former Liao territory in Mongolia. In the 1130s the Jin Dynasty rulers, known as the Golden Kings, successfully resisted the Khamag Mongol confederation, ruled at the time by Khabul Khan, great grandfather of Temujin (Genghis Khan). The Mongolian plateau was occupied mainly by five powerful tribal confederations (khanlig): Kereit, Khamag Mongol, Naiman, Mergid, and Tatar. The Jin emperors, following a policy of divide and rule, encouraged disputes among the tribes, especially between the Tatars and Mongols, in order to keep the nomadic tribes distracted by their own battles and thereby away from the Jin. Khabul's successor was Ambaghai Khan, who was betrayed by the Tatars, handed over to the Jurchen, and executed. The Mongols retaliated by raiding the frontier, resulting in a failed Jurchen counter-attack in 1143.

• published: 17 Aug 2014
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