7 Roman Emperors Everyone Should Know
Although Rome reached the pinnacle of its power and influence during the imperial era, which stretched from approximately 27 BCE to 476 CE, it wasn’t always easy for emperors during this period to run a tight ship. Not only did these imperial rulers endure threats from both hostile invaders and supposed allies who secretly plotted to gain power for themselves, but they also faced the myriad challenges of maintaining order among the disparate cultures of an empire that touched three continents and encompassed nearly 1.7 million square miles at its peak.
While some emperors succumbed to the pressures of the job and the temptation of corruption, others proved to have the vision and mettle to adjust as needed and propel the empire forward for the next generation. Here are seven Roman emperors who excelled in the role, helping ensure that the memory of Rome would endure for posterity.
Augustus (27 BCE-14 CE)
Although Julius Caesar proclaimed himself supreme leader in the dying days of the Roman Republic, it was his grandnephew and adopted son Augustus who marked a new era as Rome’s first emperor. Rich from the spoils of victory over Cleopatra’s Egypt, Augustus embarked on a building program that included necessary projects such as new roads and aqueducts, as well as awe-inspiring marvels including the Temple of Apollo Palatinus and the Theater of Marcellus. He also founded a postal system, installed a police and firefighting force, and secured the ever-expanding empire’s borders by establishing a standing army. While his boast of having transformed Rome from a city of clay to one of marble was hyperbole, it’s no exaggeration to say that Augustus’ impressive 40-year rule kick-started the two-century period of prosperity known as the Pax Romana, or “Roman Peace.”
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Vespasian (69-79 CE)
The end of Emperor Nero's controversial reign in 68 CE threatened to plunge the Roman Empire into further chaos, as a string of successors failed to establish stability in what became known as the "Year of the Four Emperors." Into that turbulence stepped Vespasian, who quelled the bloody uprisings that had accompanied him to the top and established the Flavian dynasty that endured for the next three decades. Known for his frugal ways — he once was allegedly pelted with turnips for his stinginess as proconsul of Africa — Vespasian unapologetically raised taxes to replenish the coffers that had been drained during Nero's rule. And while he used the cash to fund massive construction projects such as the Colosseum, the emperor also drew praise for showing restraint when it came to indulging in personal luxuries. Although his reign wasn't a particularly long one, Vespasian left enough of an impression that the Roman senator and historian Tacitus noted he was "the only emperor who had changed for the better."
Trajan (98-117 CE)
The second of the "Five Good Emperors" (along with Nerva, Hadrian, Antoninus Pius, and Marcus Aurelius) that comprised the Nerva-Antonine dynasty that ruled from 96-180 CE, Trajan stakes a legitimate claim to being the greatest ruler of Rome's heyday. With his treasury bolstered by the conquest of Dacia (modern-day Romania), Trajan funneled the bounty toward the building of new roads, bridges, and aqueducts, as well as a magnificent forum with its towering Trajan's Column in the city of Rome. He also had the common sense to share the wealth with the people, and he was widely beloved for reducing taxes and expanding social welfare programs that included the "alimenta" for poor and orphaned children. Trajan continued his military campaigns through his final years, and by the end of his rule, Rome had expanded to the largest territory the empire ever saw. His accomplishments were of such magnitude that future emperors were inaugurated with the words, "Sis felicior Augusto, melior Traiano," meaning "May you be more fortunate than Augustus, and better than Trajan."
Hadrian (117-138 CE)
It's tough to follow in the military footsteps of a warrior-king like Trajan, and to his credit, Hadrian didn't make much of an effort to do so. He instead focused on consolidating and strengthening the empire's borders, a strategy underscored by the construction of the 73-mile Hadrian's Wall across modern-day England, which is still standing today. Hadrian also commissioned major structures such as the Pantheon, codified Roman law with the creation of the Perpetual Edict, and was a devoted patron of the arts. Although he rankled some by embracing Greek culture and flouting his companionship with a Greek youth named Antinous, Hadrian's policies unquestionably kept the empire running at full throttle through the glory days of the second century CE.
Marcus Aurelius (161-180 CE)
A devotee of Stoicism, a Hellenistic school of philosophy emphasizing the pursuit of virtue, Marcus Aurelius is best remembered for the collection of self-reflections that comprise his famed work Meditations. Ironically, Rome's philosopher-king had little time to enjoy the inner peace he sought; his two-decade reign was marked by armed conflict with Parthians to the east and invading Germanic tribes from the north, as well as a devastating plague that wiped out millions of Roman citizens. Despite the hardships, Marcus Aurelius was largely successful at maintaining the prosperity forged by his predecessors. However, he also garners criticism from historians for passing the empire to his son Commodus, whose inept reign is considered to have brought an end to the Pax Romana.
Diocletian (284-305 CE)
How does a floundering empire overcome the half-century of infighting and territorial loss that would later be coined the "Crisis of the Third Century"? By installing an emperor with the confidence to distribute power across its far-flung boundaries. Known as the tetrarchy, this system featured two senior leaders known as augusti and a pair of junior leaders called caesars who ostensibly ruled their respective jurisdictions, though Diocletian clearly held sway above the others. More of an administrative than a battlefield genius, Diocletian increased the size of Rome's army, doubled the number of provinces, separated the powers of civic and military personnel, and established a state budget based on tax revenue. Although the tetrarchy fizzled after his reign ended, the emperor's success at forging two decades of stability was exemplified by his peaceful retirement instead of a forced abdication or murderous coup.
Constantine (306-337 CE)
Amid the jousting for power that resumed with Diocletian's departure, Constantine the Great emerged to become one of the most transformative figures of the empire's lengthy history. Unlike his predecessors, who either barely tolerated Christians or outright persecuted them, Constantine wholeheartedly embraced the growing religion. He claimed to have seen the sign of the cross in the sky before the Battle of Milvian Bridge in 312 CE, and the following year, he officially granted tolerance to Christians by issuing the Edict of Milan. After claiming sole control of the empire in 324 CE, Constantine moved his capital 850 miles east to the rebuilt city of Constantinople (formerly named Byzantium), and lured new residents with promises of free bread and citizenship. While Rome succumbed to invaders in 476 CE, the city built by its namesake continued to flourish as the Christian-populated seat of the Eastern Roman Empire for another millennium.
