CHINA: born Temüjin (1162 CE), the empire he carved–out is at its maximum at his death (1227 CE).
But his son …gedei Khan (the “Great Khan”) stretches it still further (southward and westward)—and by 1279 CE the Mongols would control all China. The Mongol Empire is at this point physically the largest contiguous empire the world has ever known—stretching well into Europe, Russia, the Middle East and the Near East, as well.