Güyük (19 March 1206 – 20 April 1248) was the third Khagan-Emperor of the Mongol Empire, the eldest son of Ögedei Khan and a grandson of Genghis Khan. He reigned from 1246 to 1248.
The death of Güyük had a profound effect on world history. Güyük wanted to turn the Mongol power against Europe, but his premature death prevented Mongol forces from trying to move further west into Europe. Subsequent to Güyük's death, Mongol family politics caused the Mongol efforts to be instead directed against southern China, which was eventually conquered during the rule of Kublai Khan.
When Kublai Khan established the Yuan Dynasty in 1271, he had Güyük Khan placed on the official record as Dingzong