Roman emperor

A Roman emperor was the supreme ruler of the Roman Empire, exercising authority that varied by period and was often shared with co-emperors.

Imperium: In ancient Rome, imperium was the authority to command armies and exercise executive power. It supplied the command authority at the heart of an emperor’s rule.
Julius Caesar: Julius Caesar was a Roman general and dictator whose concentration of power helped precipitate the end of the Republic. His dictatorship exposed the dangers of personal rule that Augustus sought to manage.
Trajan: Trajan was Roman emperor from 98 to 117 CE, during the empire’s greatest territorial extent. His conquests illustrate the reach of imperial command at its height.
Roman dictator: A Roman dictator was a republican magistrate appointed temporarily to address an emergency. The office had a defined republican mandate, unlike the durable authority of an emperor.
Roman Empire: The Roman Empire was the state that governed territories around the Mediterranean and beyond under imperial rule. The emperor’s authority operated across this changing territorial state.
Roman Senate: The Roman Senate was an elite deliberative body whose influence changed across Roman history. Emperors negotiated with a body that preserved status and influence despite losing much independent power.
Augustus: Augustus was Rome’s first emperor, ruling from 27 BCE to 14 CE while maintaining republican forms. His political settlement established the model of imperial rule.
Hadrian: Hadrian was Roman emperor from 117 to 138 CE, known for consolidating frontiers and extensive travel. His reign shows an emperor governing through inspection and frontier policy rather than expansion alone.
Roman consul: A Roman consul was one of two annually elected chief magistrates of the Republic. Consuls shared limited terms and collegial authority, unlike emperors’ long tenure.
Tetrarchy: The Tetrarchy was Diocletian’s system of four rulers, with two senior emperors and two junior colleagues. It made shared imperial rule an explicit solution to succession and defense.

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