Möngke (ˈmɒŋkeɪ ; 11 January 1209 – 11 August 1259) was the fourth khagan of the Mongol Empire, ruling from 1 July 1251, to 11 August 1259. He was the first Khagan from the Toluid line, and made significant reforms to improve the administration of the Empire during his reign. Under Möngke, the Mongols conquered Iraq and Syria as well as the kingdom of Dali (modern-day Yunnan).
According to William of Rubruck, Möngke Khan was a man of medium height.
Möngke was born on 11 January 1209, as the eldest son of Genghis Khan's teenaged son Tolui and Sorghaghtani Beki. Teb Tengri Khokhcuu, a shaman, claimed to have seen in the stars a great future for the child and bestowed on him the name Möngke, "eternal" in the Mongolian language. His uncle Ögedei Khan's childless queen Angqui raised him at her orda (nomadic palace). Ögedei instructed Persian scholar Idi-dan Muhammed to teach writing to Möngke.
On his way back home after the Mongol conquest of Khwarezmia, Genghis Khan performed a ceremony on his grandsons Möngke and Kublai after their first hunting in 1224 near the Ili River. Möngke was fifteen years old, and with his brother, Kublai, killed a rabbit and an antelope. Their grandfather smeared fat from the killed animals onto their middle fingers following the Mongol tradition.
In 1230, Möngke went to war for the first time, following Ögedei Khan and his father Tolui into battle against the Jin dynasty. Tolui died in 1232, and Ögedei appointed Sorghaghtani head of the Toluid appanage. Following the Mongol custom, Möngke inherited at least one of his father's wives, Oghul-Khoimish of the Oirat clan. Möngke deeply loved her and gave special favor to her elder daughter, Shirin.
Ögedei dispatched him along with his relatives to attack the Kipchaks, Kievan Rus', and Bulgars in the west in 1235. When the most formidable Kipchak chief, Bachman, fled to an island in the Volga delta. Möngke crossed the river and captured him. When he ordered Bachman to bend down on his knees, Bachman refused and was executed by Möngke's brother Bujek.