Question: The Lopsi Liburnian tribe inhabited the mountains along the eastern coast of the Adriatic before and during this Empire and had the largest City in the world between which years?
Sentence (from "Roman Empire"): The city of Rome was the largest city in the world  100 BC  AD 400 , with Constantinople (New Rome) becoming the largest around AD 500, and the Empire's populace grew to an estimated 50 to 90 million inhabitants (roughly 20% of the world's population at the time).
Relevant evidence: Yes