The Third Century Crisis: Rome Nearly Comes Apart in 50 Years of Chaos
What happened
After the assassination of Emperor Alexander Severus in 235 CE, Rome entered roughly 50 years without stable leadership. World History Encyclopedia counts over 20 emperors rising and falling between 235 and 284, compared with 26 emperors across the previous 250-plus years combined. Most seized power through the army and were killed by their own troops or rivals within months or a few years. At the same time, Germanic peoples pressed across the Rhine and Danube, the Sasanian Persian Empire attacked in the east, plague spread through the population, and repeated currency debasement drove severe inflation. The empire briefly split into three competing states: a Gallic Empire in the west founded by Postumus around 260 CE covering Gaul, Britain, and Spain, the core Roman territory in the middle, and a Palmyrene Empire in the east under Queen Zenobia from around 270 CE, stretching from Syria through Egypt.
Why it matters
This wasn't a slow decline. For a stretch of years Rome existed as three separate states at once, something that had never happened before and came close to being permanent fragmentation rather than a temporary split. The debasement of the coinage during this period was so severe that it broke the empire's monetary system for a generation and forced later emperors into entirely new currency and tax systems just to make the state solvent again.
How we know
The chronology of rapid successions comes from surviving Roman histories and fragmentary imperial biographies, cross-checked against coin hoards and inscriptions that record which emperor was in power in which year and region. The Gallic and Palmyrene breakaway states are confirmed by their own separate coinage, which used different imagery and legends from central Roman issues, and by inscriptions naming their own rulers in their own right.
Sources
- World History Encyclopedia. The Crisis of the Third Century · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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Part of a timelineAncient Rome30 events · From a legendary fratricide on the Palatine Hill to a teenage emperor's quiet deposition twelve centuries later, told through the battles, plagues, and one bridge-crossing that ended a republic.View all →