Genghis Khan, born as Temujin in 1162, was the founder and Great Khan of the Mongol Empire, which became the largest contiguous empire in history after his death. He united the Mongolian tribes and initiated a series of military campaigns that expanded Mongol territory across Asia and into Europe. Genghis Khan is significant for his innovative military strategies, emphasis on meritocracy, and establishment of trade routes that facilitated cultural exchange and commerce, including the Silk Road. His legacy includes the promotion of religious tolerance and the establishment of a legal code known as the Yassa, which influenced subsequent empires.