Genghis Khan ruled the Mongol Empire in the 13th century, transforming it into the largest contiguous empire in history. Born as Temüjin around 1162, he united various nomadic tribes of the steppes and established his reign in 1206. His empire expanded rapidly through a series of military campaigns and conquest, covering vast territories across Eurasia from Eastern Europe to East Asia. Genghis Khan is known for implementing innovative military strategies, creating a unifying legal code called the Yassa, and allowing religious tolerance within his empire. His leadership laid the foundation for Mongol influence that persisted long after his death in 1227.