Genghis Khan (c. 1162–1227), born Temüjin, was a Mongol conqueror who founded the Mongol Empire, the largest contiguous empire in history. He came to power by uniting many of the nomadic tribes of Northeast Asia after years of fighting, and became the first Great Khan (Emperor) of the Mongols in 1206.
Under his leadership, the Mongols rapidly expanded their territory, conquering vast swathes of Asia and Europe. Genghis Khan's military campaigns were marked by their ruthlessness and efficiency, and he is considered one of the most successful military commanders in history. He also introduced several reforms and innovations that helped to strengthen and unify the Mongol Empire, such as the establishment of a centralized government, the adoption of a written language, and the promotion of religious tolerance.
Genghis Khan died in 1227 during his campaign against the Western Xia kingdom, and was succeeded by his third son, Ögedei Khan. His empire continued to expand under the leadership of his successors, but eventually fragmented into several smaller khanates. Despite its eventual decline, the Mongol Empire had a profound impact on the history of Asia and Europe, and Genghis Khan remains one of the most iconic and influential figures in world history.