Constantinopla was considered the capital of the Eastern Roman Empire.
Explanation:
Constantinople was considered the capital of the easter Roman Empire in the period of late antiquity because its geopolitical importance was definitive to positioned an advantage over the enemies, as well as to administrate and keep the empire regulated. The location of Constantinople was in actual Istambul Turkey. It was located in the center of the south, and eastern territories and it was backed up by the Greek lands.