Sentence:  Next to them, the maritime region extending south to the Hellespont is <WSD>Romania</WSD>—a Greek nation, though it was once barbarian, and it is returning to barbarism in our own time, now that the empire of the Greeks has been destroyed and the Turks hold sway. The capital city of this country [Thrace] is Byzantium, formerly called Agios. 
Meaning of the word marked with <WSD> tags:  The Byzantine Empire or its former territories.