Comparative studies of the Roman and Han empires

Historians have engaged in historical comparative research involving the roughly contemporaneous Roman Empire and the Han dynasty of early imperial China. At their peaks, both states controlled up to a half of the world population and produced political and cultural legacies that endure to the modern era; comparative studies largely focus on their similar universal scale at their pinnacles and on synchronism in their rise and decline.

Source: Wikipedia — Comparative studies of the Roman and Han empires (CC BY-SA 4.0)