Atila the hun.
Attila is the leader of the Huns, but he did not attack first the Visogoths did.
Pope Leo saved Rome from the Huns.
Attila
Alexander the Great had nothing to do with ancient Rome. He was a Macedonian king and military leader. His conquests were east, while Rome was in the west.
The invaders of the Roman Empire pillaged the areas they invaded. This was common in those days.
Over the long period of existence, ancient Rome had many important political leaders. It's a subjective question and based on what I have read about ancient Rome, I believe that Augustus Caesar was the most important political leader in ancient Rome's history. The reasons for my choice of Augustus are many fold. Foremost in my mind is this; After the Civil War with Mark Antony & Cleopatra, Octavian then known as, was the supreme leader of ancient Rome. He brought a great degree of stability to Rome compared to previous times. Augustus had flaws of course but I rank him as the most important leader.
Plebeian tribunes were elected leaders of ancient Rome who represented plebeians.
Atilla.
Michael blackmon
A republic
the huns
the first invaders ever to invade rome was the huns!!