Totally Rome
The Roman emperors — a guide to who ruled and when
From Augustus to Constantine — the rulers whose monuments, portraits and reputations still shape the city.
The Julio-Claudians (27 BC – 68 AD)
Augustus, the first emperor, transformed Rome from brick to marble and established the imperial system. His successors — Tiberius, Caligula, Claudius, Nero — ranged from competent to catastrophic; Nero's excesses and the great fire of 64 AD ended the dynasty in chaos.
The Flavians and the Colosseum (69–96 AD)
Vespasian, who seized power after the "Year of the Four Emperors," began construction of the Colosseum specifically as a gift to the Roman people, funded partly by the spoils of the Jewish War — a deliberate contrast with Nero's private pleasure palace on the same site.
The "Five Good Emperors" (96–180 AD)
Nerva, Trajan, Hadrian, Antoninus Pius and Marcus Aurelius presided over the empire's territorial peak and a long period of relative stability. Trajan's Column and Hadrian's Pantheon and mausoleum (now Castel Sant'Angelo) date from this era — arguably Rome's greatest architectural period.
Crisis and Constantine (180–337 AD)
The 3rd century brought decades of civil war, economic crisis and rapid emperor turnover. Diocletian's reforms stabilised the empire before Constantine legalised Christianity and moved the capital to Constantinople, beginning Rome's long transition from imperial capital to papal city.
