In the medieval times, the whole world was in chaos from the East to West of Eurasia. Who was the savior of the world?

In the medieval times, the Middle Kingdom Empire or HAN Empire in the East of Eurasia felt apart into civil war and faced the barbarians invasion from the West front for several decades until the Great Tang Empire reemerging from the chaos in A.D. 618. In the middle of Eurasia, Persian Empire faced the increasing Islamic Arabian Empire challenges, fallen apart and completely collapsed until A.D. 640. The Persian Emperor sent his Prince to the Tang Empire to seek aid to restore his Empire. While the Byzantine Empire or the Eastern Roman Empire survived the split of Rome Empire in the West of Eurasia, the fragmentation and fall of the Western Roman Empire in the 5th century but also continued to battle with the rising barbarians from all directions. The lifeline of the Silk Road for the world is broken and ceased. The whole world was in chaos, battling against barbarians. Who was going to be the savior of the world? One of the most powerful Chinese Empress and later entered the world stage in A.D. 648. Our show story starts here.