How Byzantium saved and transmitted classic art and the Greek classics

How Byzantium saved and transmitted classic art and the Greek classics later on in the Arabic world and in the West. In the 5th century the Greco-roman world declines and faces collapse. At that crucial moment the Eastern Roman empire remains a beacon of classic art and literature, throughout the middle ages. The contribution of Byzantium in the transmission of Greek classics was very significant . In the year 355-356 AD the imperial library of Constantinople is being founded by emperor Constantius II and