Genghis Khan dies in 1227 from illness. His successors continue to expand Mongol rule, and in less than 50 years they had conquered land from China to Poland. This will become the largest unified empire in history. Armies under the leadership of Genghis Khans grandsons (new rulers after Genghis Khan died) continued south, east, and west, and reached the banks of the Adriatic Sea. In 1250, they split the Mongol empire into four parts called khanates. They were known as: Khanate as Great Khan (Mongolia and China), The Khanate of Chagatai (Central Asia), The Ilkhanate (Persia), and the Khanate of the Golden Horde (Russia).