The document summarizes the Mongol empire, which originated from nomadic tribes in East Asia and became the largest land empire in history under the leadership of Genghis Khan in the 13th-14th centuries. The Mongols conquered much of Asia and Eastern Europe through skilled horse riding and warfare. At its peak, the Mongol empire stretched from Eastern Europe to the Sea of Japan, covering around 16% of Earth's land. The empire later fractured into khanates ruled by Genghis Khan's descendants in regions like Russia, India, and China, leaving a cultural legacy but also causing immense destruction and spreading pandemics during its rapid rise and expansion.