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"): Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title "Augustus", effectively marking the end of the Roman Republic.
Relevant evidence: No