Kublai Khan (23 September 1215 – 18 February 1294), also known by his temple name as the Emperor Shizu of Yuan and his regnal name Setsen Khan, was the founder and first emperor of the Mongol-led Yuan dynasty of China. He proclaimed the dynastic name "Great Yuan" in 1271, and ruled Yuan China until his death in 1294.

Kublai was the second son of Tolui by his chief wife Sorghaghtani Beki, and a grandson of Genghis Khan. He was almost 12 when Genghis Khan died in 1227. He had succeeded his older brother Möngke as Khagan in 1260, but had to defeat his younger brother Ariq Böke in the Toluid Civil War lasting until 1264. This episode marked the beginning of the division of the Mongol Empire. Kublai's real power was limited to the Yuan Empire, even though as Khagan he still influenced the Ilkhanate and, to a significantly lesser degree, the Golden Horde.

In 1271, Kublai established the Yuan dynasty and formally claimed orthodox succession from prior Chinese dynasties. The Yuan dynasty came to rule over most of present-day China, Mongolia, Korea, southern Siberia, and other adjacent areas. He also amassed influence in the Middle East and Europe as Khagan. By 1279, the Yuan conquest of the Song dynasty was completed and Kublai became the first non-Han emperor to rule all of China proper. As emperor, he ordered invasions of Japan, Vietnam, Burma and Java.

Kublai Khan was the fourth son of Tolui, and his second son with Sorghaghtani Beki. As his grandfather Genghis Khan advised, Sorghaghtani chose a Buddhist Tangut woman as her son's nurse, whom Kublai later honored highly. On his way home after the Mongol conquest of Khwarezmia, Genghis Khan performed a ceremony on his grandsons Möngke and Kublai after their first hunt in 1224 near the Ili River. Kublai was nine years old and with his eldest brother killed a rabbit and an antelope. After his grandfather smeared fat from the killed animals onto Kublai's middle finger per a Mongol tradition, he said "The words of this boy Kublai are full of wisdom, heed them well – heed them all of you." The elderly Genghis Khan would die three years after this event in 1227, when Kublai was 12. Kublai's father Tolui would serve as regent for two years until Genghis' successor, Kublai's third uncle Ogedei, was enthroned as Khagan in 1229.

After the Mongol conquest of the Jin dynasty, in 1236, Ogedei gave Hebei (attached with 80,000 households) to the family of Tolui, who died in 1232. Kublai received an estate of his own, which included 10,000 households. Because he was inexperienced, Kublai allowed local officials free rein. Corruption amongst his officials and aggressive taxation caused large numbers of ethnic Han peasants to flee, which led to a decline in tax revenues. Kublai quickly came to his appanage in Hebei and ordered reforms. Sorghaghtani Beki sent new officials to help him and tax laws were revised. Thanks to those efforts, many of the people who fled returned.

The most prominent, and arguably most influential, component of Kublai Khan's early life was his study and a strong attraction to contemporary Han culture. Kublai invited Haiyun, the leading Buddhist monk in northern China, to his ordo in Mongolia. When he met Haiyun in Karakorum in 1242, Kublai asked him about the philosophy of Buddhism. Haiyun named Kublai's son, who was born in 1243, Zhenjin. Haiyun also introduced Kublai to the formerly Taoist, and at the time Buddhist monk, Liu Bingzhong. Liu was a painter, calligrapher, poet, and mathematician, and he became Kublai's advisor when Haiyun returned to his temple in modern Beijing. Kublai soon added the Shanxi scholar Zhao Bi to his entourage. Kublai employed people of other nationalities as well, for he was keen to balance local and imperial interests, Mongol and Turkic.

In 1251, Kublai's eldest brother Möngke became Khan of the Mongol Empire, and Khwarezmian Mahmud Yalavach and Kublai were sent to China proper. Kublai received the viceroyalty over northern China and moved his ordo to central Inner Mongolia. During his years as viceroy, Kublai managed his territory well, boosted the agricultural output of Henan, and increased social welfare spending after receiving Xi'an. These acts received great acclaim from ethnic Han warlords and were essential to the founding of the Yuan dynasty. In 1252, Kublai criticized Mahmud Yalavach, who was never highly valued by his ethnic Han associates, over his cavalier execution of suspects during a judicial review, and Zhao Bi attacked him for his presumptuous attitude toward the throne. Möngke dismissed Mahmud Yalavach, which met with resistance from Han Confucian-trained officials.

In 1253, Kublai was ordered to attack Yunnan and he tried to ask the Dali Kingdom to submit. The ruling Gao family resisted and killed Mongol envoys. The Mongols divided their forces into three. One wing rode eastward into the Sichuan basin. The second column under Subutai's son Uriyangkhadai took a difficult route into the mountains of western Sichuan. Kublai went south over the grasslands and met up with the first column. While Uriyangkhadai travelled along the lakeside from the north, Kublai took the capital city of Dali and spared the residents despite the slaying of his ambassadors. The Dali emperor Duan Xingzhi (段興智) himself defected to the Mongols, who used his troops to conquer the rest of Yunnan. Duan Xingzhi, the last king of Dali, was appointed by Möngke Khan as the first tusi or local ruler; Duan accepted the stationing of a pacification commissioner there. After Kublai's departure, unrest broke out among certain factions. In 1255 and 1256, Duan Xingzhi was presented at court, where he offered Möngke Khan maps of Yunnan and counsels about the vanquishing of the tribes who had not yet surrendered. Duan then led a considerable army to serve as guides and vanguards for the Mongol army. By the end of 1256, Uriyangkhadai had completely pacified Yunnan.