Genghis Khan, originally named Temujin, was the first ruler of a unified Mongol Empire after bringing together various warring tribes in the early 13th century. Through both diplomacy and military prowess, he established a vast empire that stretched from Asia to Europe. His leadership styles, including meritocracy, religious tolerance, and innovative military tactics, significantly enhanced the cohesion and effectiveness of his forces. Genghis Khan's conquests paved the way for the Mongol Empire's expansion, leading to an unparalleled era of trade and cultural exchange across Eurasia and laying the groundwork for subsequent Mongol rulers.