Hi, my name is Zach Toombs for About.com and today we're giving an overview of the ilfe of Genghis Khan, once the emperor of the Mongol region.Genghis Khan, originally named Temüjin, was born in the northeastern corner of present-day Mongolia. When he was nine his father, a nephew of the last khan of the Mongols, was killed by the rival Tatars, the then dominant tribe in eastern Mongolia. Once Temüjin had grown, he was taken prisoner by the Taichi'uts, a rival clan. He managed to escape and became the protégé of Toghril, the leader of a tribe in central Mongolia called the Kereits. Mongol princes declared Temüjin to be their ruler, giving him the title he is known by today, Genghis Khan.Genghis Khan's former leader Toghril was exiled and restored thanks to Genghis in 1198. The two rulers allied with the Chin rulers of North China against the Tatars. From this campaign Toghril became known as Ong-Khan. At this point Genghis Khan's relations with Ong-Khan had fallen to open warfare. Genghis had to retreat to northeastern Mongolia after a defeat, but the next year rallied and gained a decisive victory against Ong-Khan, who fled to the west and was killed by the Naimans.Genghis Khan then turned his attention toward western Mongolia, and was able to defeat the remaining tribes. This ended in capturing and putting to death his former friend Jamuka, effectively becoming the undisputed ruler of the entirety of Mongolia. In 1206, a meeting of Mongol princes proclaimed Genghis as the universal monarch of all of Mongolia. With the entire nation at his back, Genghis Khan was able to focus on foreign conquests.For the next 21 years Genghis Khan continued to conquer almost everything in his path. He started by breaching the Great Wall of China and conquering a sizable northern portion of the country. He often returned to his home of Mongolia, and expanded his empire from all possible boarders. He eventually conquered most of Central Asia and China, and the borders would continue to expand under his successors. It was on August 25, 1227 that he died in the mountains during a battle. He left behind the largest empire in recorded history.Thanks for watching our video about the life of Genghis Khan. For more information, please visit About.com.