Güyük (also Güyug; c. March 19, 1206 – April 20, 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. Appearance According to Giovanni da Pian del Carpine, Güyük was of "medium stature, very prudent and extremely shrewd, and serious and sedate in his manners." Early life Güyük received military training and served as an officer under his grandfather Genghis Khan and later his father Ögedei Khan (after the death of Genghis in 1227). He married Oghul Qaimish of the Merkit clan. In 1233, Güyük, along with his maternal cousin Alchidai and the Mongol general Tangghud, conquered the short-lived Dongxia Kingdom of Puxian Wannu, who was a rebellious Jin official, in a few months. After the death of Güyük's uncle Tolui, Ögedei proposed that Sorghaghtani, the widow of Tolui, marry his son Güyük. Sorghaghtani declined, saying that her prime responsibility was to her own sons. According to Ata-Malik Juvayni, Güyük, son of Ögedei, was a Christian, but does not specify of what denomination. Güyük participated in the invasion of Eastern and Central Europe in 1236–1241 with other Mongol princes, including his cousin Batu and half-brother Kadan. He led his corps in the Siege of Ryazan and the lengthy siege of the Alanian capital Maghas. During the course of the conquest, Güyük quarreled violently with Batu at the victory banquet and screamed at him, "Batu is just an old woman with a quiver". Güyük and Büri, a grandson of Chagatai, stormed out of the banquet and rode away swearing and cursing. When word reached the Great Khan, they were recalled for a time to Mongolia. Ögedei refused to see them and threatened to have his son Güyük executed. Ögedei calmed down and finally admitted Güyük into his ger. Ögedei criticized Güyük, "Do you think that the Russians surrendered because how mean you were to your own men. ...Because you captured one or two warriors, you think that you won the war. But you didn't capture even a single kid goat." Ögedei reprimanded his son harshly for fighting within the family and for mistreating his soldiers. Güyük was dispatched again to Europe. In the meantime, Ögedei had died (in 1241), and his widow Töregene had taken over as regent, a position of great influence and authority that she used to advocate for her son Güyük.