This is a list of Roman Emperors with the dates they controlled the Roman Empire.

(Note that, contrary to popular belief, Julius Caesar was never Emperor (princeps), although he was named dictator for life in 45 BC (but was not the first Roman to hold that title) and was regarded as such by Roman historians. On the other hand, the name Caesar became the family name of the first dynasty and was effectively treated as a title, a practice which continued throughout the Empire. Similarly, Suetonius wrote of The Twelve Caesars (including the Flavians) so some sense of continuity was evidently felt.)

For the worship of the Roman Emperor as a god, see imperial cult.

For a simplified list see: Concise List of Roman Emperors

italics: claimant who cannot be considered to have ruled or held power over part of the empire only
bold italics: nickname by which the individual is commonly known

The Principate/Julio-Claudian dynasty

Year of the four emperors

Flavian Dynasty

Nervan-Antonian dynasty

Severan Dynasty, African, Asian and Syrian Emperors

Rulers during the Crisis of the Third Century

Illyrian Emperors

Tetrarchy

'Collegiate Emperors' of the Constantine Dynasty

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