Kitbuqa

Kitbuqa Noyan, also spelled Kitbogha or Ketbugha (died 1260), was a Nestorian Christian of the Naiman tribe, a group that was subservient to the Mongol Empire. He was a lieutenant and confidant of the Mongol Ilkhan Hulagu, assisting him in his conquests in the Middle East. When Hulagu took the bulk of his forces back with him to attend a ceremony in Mongolia, Kitbuqa was left in control of Syria, and was responsible for further Mongol raids southwards towards Egypt. He was killed at the Battle of Ain Jalut in 1260.
Biography.
In 1252, Möngke Khan ordered Kitbuqa to lead the advance guard of Hulegu's army against the fortresses of the Nizari Ismailis. He advanced with Hulagu into western Persia, mounting a series of sieges, and commanded one of the flanks that sacked Baghdad, before assisting in the conquest of Damascus in 1260. Historical accounts, quoting from the writings of the medieval historian Templar of Tyre, would often describe the three Christian rulers (Hetoum I of Armenia, Bohemond VI of Antioch, and Kitbuqa) entering the city of Damascus together in triumph, though modern historians have characterized this story as apocryphal.
When Hulagu Khan withdrew his forces, responding to internal events in the Mongol Empire (the death of Hulagu's brother, the Great Möngke Khan), Kitbuqa was left in charge of the Mongol army remaining in the Middle East:
Battle of Ain Jalut.
In command of a force including 10,000 Mongol troops, Kitbuqa attempted to continue the Mongol advance towards Egypt. However, the Mamluks had negotiated a passive truce with the Crusaders, allowing the Mamluks to advance northwards through Crusader territory, and camp for resupply near the Crusader stronghold of Acre. In this way, the Mamluks were able to engage the depleted Mongol army near Galilee, at the pivotal Battle of Ain Jalut (spring of Goliath). The Mongols were defeated, and Kitbuqa was captured. When he was brought, bound, before the Mamluk sultan he was defiant, describing the Mongol vengeance that would befall the victors. He taunted the Mamluk emirs, saying how he had always been loyal to his master, whilst they had betrayed theirs. Kitbuqa was slaughtered at the hands of veteran Mamluk Jamal al-Din Akoush al-Shamsy.
Mamluk histories speak of Kitbuqa with respect, painting him as a great warrior who refused to retreat when the Mongols were clearly being overpowered at Ain Jalut, and who favored death in battle over retreat and shame. It was expected that Kitbuqa's death would be avenged by Hulagu, but an internal conflict between Hulagu and his cousin Berke of the Mongol Golden Horde prevented this from happening. Kitbuqa's death and the defeat of the Mongols at Ain Jalut marked the beginning of the end for the Westward expansion of the Mongol Empire. It was the first occasion they had been decisively defeated and failed to avenge such a loss, though the Mongols continued to invade Syria, Japan, Hungary, Poland and Southeast Asia for the next several decades.