Güyük (cyrillic:Гүюг хаан; c. 1206–1248) was the third Great Khan of the Mongol Empire. He was the son of Ögedei Khan, grandson of Genghis Khan, and reigned from 1246 to 1248. His brother was Kadan.
He participated in the invasion of Russia and eastern Europe in 1236-1241 with other Mongol princes, including his cousin Batu. During the course of the invasion, Güyük quarreled violently with Batu and was recalled for a time to Mongolia. This breach between the families of Jöchi and Ögedei, the first and third sons of Genghis Kahn, would widen over time and prove the ultimate downfall of the Mongol Empire.
In the meantime Ögedei had died in 1241, and his widow Töregene had taken over as regent, a position of great influence and authority which she used to advocate for her son Güyük. Batu withdrew from Europe so that he might have some influence over the succession, but despite his delaying tactics, Töregene succeeded in getting Güyük elected Khan in 1246.
The showdown never happened— Güyük died in route, in what is now Xinjiang; he had succumbed at about the age of forty-two to the combined effects of alcoholism and gout. His widow Oghul Qaimish took over as regent, but she would be unable to keep the succession within her branch of the family. Möngke succeeded as Khan in 1251.
Genghis Khan's sons and grandsons, were haunted by alcoholism, a vice that Genghis himself had detested. Despite this, Genghis himself once remarked that it was not realistic to expect a man not to get drunk on occasion. The death of Güyük had a profound effect on history. Güyük wanted to turn the Mongol power against Europe. Because of Güyük's premature death, Mongol family politics caused the Mongol efforts to be directed against southern China, which was eventually conquered in the time of Kublai Khan.
Güyük's reign showed that the split between Batu's line, the descendants of Jöchi, and the rest of the family was the fatal flaw in the unity of all the Mongol Empire. The civil war which split the empire into rival khanates might well have occurred in Güyük's time had he not died early. Batu eventually backed Möngke and helped to establish him as Great Khan, thereby replacing the house of Ögodei with that of Tolui.
Oghul Qaimish, whom Möngke had called "more contemptible than a bitch" to a European visitor, was executed after Batu and Möngke affected the family coup.
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