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Han involvement in Central Asia and Sogdia helped establish the land route of the Silk Road, replacing the earlier path over the Himalayas to India.Han China gradually became the largest economy of the ancient world.His dynasty also conquered the Yue tribes in Guangxi, Guangdong, and Vietnam.
For millennia, China's political system was based on hereditary monarchies, or dynasties, beginning with the semi-legendary Xia dynasty.
Numismatists use Anastasius as the beginning of Byzantine because he dramatically reformed the bronze coinage.
A significant minority of numismatists pick an earlier time and ruler, often Constantine the Great, as the dividing time between the Roman and Byzantine empires, because most coins were issued from Constantinople, or since it became the seat of government.
Although the citizens generally spoke Greek, they considered themselves Roman for the entire Byzantine period, making our division of the empire an entirely modern convention.
identified it as Theophilus' first issue after Michael's death (2 Oct 829 - 830 A. Theophilus was an accomplished scholar and highly cultured.