Instructions: The answer to the question can be given by describing the Roman empire and its division by Diocletian. Both divisions must be named with the respective capitals.
Solution:
The Roman Empire was the largest ancient Empire.
Diocletian, the Emperor of Rome, divided the Empire into two parts in the fourth century C.E. This was done for administrative convenience.
The Western Roman Empire was set up with its capital at Rome, and the Eastern Roman Empire was set up with its capital at Constantinople.
The Roman Empire collapsed with the capture of Constantinople by the Turks in 1453 CE.