Genghis Khan, born Temujin, rose from a brutal childhood to unify the nomadic tribes of the Mongolian plateau. In 1206, he was proclaimed 'Universal Ruler.' Through innovative military tactics, a meritocratic promotion system, and psychological warfare, he launched a series of conquests that led to the creation of the Mongol Empire—the largest contiguous land empire in history. While his conquests were devastatingly violent, his rule also brought about the 'Pax Mongolica,' a period of relative peace that allowed for unprecedented trade and cultural exchange along the Silk Road. He implemented the 'Yassa' code of law, promoted religious tolerance, and established a sophisticated postal system. His descendants, including Kublai Khan, continued to expand the empire, forever altering the demographics and political structures of Eurasia.