"Brief Roman History"

Age of the Emperors
Augustus’ rule restored morale in Rome after a century of discord and corruption and ushered in the famous pax Romana–two full centuries of peace and prosperity.

He instituted various social reforms, won numerous military victories and allowed Roman literature, art, architecture and religion to flourish. Augustus ruled for 56 years, supported by his great army and by a growing cult of devotion to the emperor. When he died, the Senate elevated Augustus to the status of a god, beginning a long-running tradition of deification for popular emperors.

Augustus’ dynasty included the unpopular Tiberius (A.D. 14-37), the bloodthirsty and unstable Caligula (37-41) and Claudius (41-54), who was best remembered for his army’s conquest of Britain. The line ended with Nero (54-68), whose excesses drained the Roman treasury and led to his downfall and eventual suicide.

Four emperors took the throne in the tumultuous year after Nero’s death; the fourth, Vespasian (69-79), and his successors, Titus and Domitian, were known as the Flavians, and they attempted to temper the excesses of the Roman court, restore Senate authority and promote public welfare. Titus (79-81) earned his people’s devotion with his handling of recovery efforts after the infamous eruption of Vesuvius, which destroyed the towns of Herculaneum and Pompeii.

The reign of Nerva (96-98), who was selected by the Senate to succeed Domitian, began another golden age in Roman history, during which four emperors–Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius–took the throne peacefully, succeeding one another by adoption, as opposed to hereditary succession. Trajan (98-117) expanded Rome’s borders to the greatest extent in history with victories over the kingdoms of Dacia (now northwestern Romania) and Parthia. His successor Hadrian (117-138) solidified the empire’s frontiers (famously building Hadrian's Wall in present-day England) and continued his predecessor’s work of establishing internal stability and instituting administrative reforms.

Under Antoninus Pius (138-161), Rome continued in peace and prosperity, but the reign of Marcus Aurelius (161–180) was dominated by conflict, including war against Parthia and Armenia and the invasion of Germanic tribes from the north. When Marcus fell ill and died near the battlefield at Vindobona (Vienna), he broke with the tradition of non-hereditary succession and named his 19-year-old son Commodus as his successor.

Decline and Disintegration
The decadence and incompetence of Commodus (180-192) brought the golden age of the Roman emperors to a disappointing end. His death at the hands of his own ministers sparked another period of civil war, from which Lucius Septimius Severus (193-211) emerged victorious. During the third century Rome suffered from a cycle of near-constant conflict. A total of 22 emperors took the throne, many of them meeting violent ends at the hands of the same soldiers who had propelled them to power. Meanwhile, threats from outside plagued the empire and depleted its riches, including continuing aggression from Germans and Parthians and raids by the Goths over the Aegean Sea.

The reign of Diocletian (284-305) temporarily restored peace and prosperity in Rome, but at a high cost to the unity of the empire. Diocletian divided power into the so-called tetrarchy (rule of four), sharing his title of Augustus (emperor) with Maximian. A pair of generals, Galerius and Constantius, were appointed as the assistants and chosen successors of Diocletian and Maximian; Diocletian and Galerius ruled the eastern Roman Empire, while Maximian and Constantius took power in the west. The stability of this system suffered greatly after Diocletian and Maximian retired from office. Constantine (the son of Constantius) emerged from the ensuing power struggles as sole emperor of a reunified Rome in 324. He moved the Roman capital to the Greek city of Byzantium, which he renamed Constantinople. At the Council of Nicaea in 325, Constantine made Christianity (once an obscure Jewish sect) Rome’s official religion.