The Roman Empire
(27 B.C. - 476 A.D.)
After existing for nearly 500 years as a Republic, popular government failed in ancient Rome and the Roman Empire began with the principate of Augustus. The Pax Romana lasted for nearly two centuries, followed by nearly three centuries of decline until Rome fell in 476 A.D. This was a critical period of history, as Christianity began its rise to global prominence during this time.