Genghis Khan established the Mongol Empire, which became the largest contiguous empire in history after his unification of the Mongol tribes. Ascending to power in the early 13th century, he led military campaigns that expanded his territory throughout Asia and into Eastern Europe. Genghis Khan was known for his innovative military tactics and the incorporation of conquered peoples into his administration. The empire facilitated trade, communication, and cultural exchange across Eurasia, which had lasting effects on global history.