1 janv. 235 - Crisis of the Third Century

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The Crisis of the Third Century, also known as Military Anarchy or the Imperial Crisis (AD 235–284), was a period in which the Roman Empire nearly collapsed under the combined pressures of barbarian invasions and migrations into the Roman territory, civil wars, peasant rebellions, political instability (with multiple usurpers competing for power), Roman reliance on (and growing influence of) barbarian mercenaries known as foederati and commanders nominally working for Rome (but increasingly independent), plague, debasement of currency, and economic depression.

The crisis began with the assassination of Emperor Severus Alexander by his own troops in 235. This initiated a 50-year period during which there were at least 26 claimants to the title of emperor, mostly prominent Roman army generals, who assumed imperial power over all or part of the Empire. The same number of men became accepted by the Roman Senate as emperor during this period and so became legitimate emperors.

By 268, the empire had split into three competing states: the Gallic Empire (including the Roman provinces of Gaul, Britannia and, briefly, Hispania); the Palmyrene Empire (including the eastern provinces of Syria Palaestina and Aegyptus); and, between them, the Italian-centered independent Roman Empire proper. Later, Aurelian (270–275) reunited the empire. The crisis ended with the ascension of Diocletian and his implementation of reforms in 284.

The crisis resulted in such profound changes in the empire's institutions, society, economic life, and religion that it is increasingly seen by most historians as defining the transition between the historical periods of classical antiquity and late antiquity.

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