What elements changed as the Byzantine Empire Progressed in power from the Roman Empire, what elements became more Greek in culture?

Ostrogorski described the Byzantine Empire thus: „Roman government, Greek culture and Christianity are the key foundations of the Byzantine development. A lack of any of those elements would mamecthe very existence of Byzantium

Explanation:

the qing dynasty placed strict limits on foreign merchants' ability to trade in china.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.