Excerpts from Books and Wikipedia
"During the quriltai [assembly] the tribes formally acclaimed Temujin as their supreme leader, giving him the title Genghis Khan ('Universal Ruler'). . . . Because of his skill and daring, Temujin soon acquired a loyal following of young warriors, and in 1195 he was accepted as khan of the Mongols. . . . But Genghis Khan turned Mongol aggression outward in a series of terrifying campaigns. One of his armies rampaged through the Middle East, and the other conquered Georgia and what is now Russia. The expansion continued after Genghis Khan's death in 1227, creating the largest contiguous land empire in world history." [1001 Days] "Genghis also developed a legal code for his people, called the Jasagh or Yasa. He learned about cities from the Muslims and farms from the Chinese. He respected tradesmen and artisans and often spared them in his conquests. Religiously tolerant, he welcomed Buddhists, Christians, Taoists, and other to his court. According to a Persian historian, he 'used to hold in esteem beloved and respected sages and hermits of every tribe, considering this a procedure to please God.'"