In the gallery of Roman imperial portraits, few faces project the raw, brooding menace of Marcus Aurelius Severus Antoninus, universally known by his military nickname Caracalla. Ruling the Roman Empire from 198 to 217 AD, the elder son of Septimius Severus murdered his own younger brother in their mother’s arms, massacred thousands of civilians in Alexandria over a satirical joke, and bankrupted the treasury to bribe his frontier legions. Yet this ruthless autocrat also enacted the single most transformative civil rights decree in the history of the ancient world: the Constitutio Antoniniana of 212 AD, which granted full Roman citizenship to every free inhabitant of the empire overnight.
The Military Cloak and the Murder of Geta
Born Lucius Septimius Bassianus in Lugdunum (modern Lyon, France) in 188 AD to the North African general Septimius Severus and the Syrian noblewoman Julia Domna, the young prince earned the nickname Caracalla from the hooded Gallic-style military tunic he wore on campaign and popularized across the army. Before Septimius Severus died while campaigning in York, Britain, in February 211 AD, he left his two fiercely rivalrous sons—twenty-two-year-old Caracalla and twenty-one-year-old Geta—with a famous, cynical piece of dying advice: “Be harmonious with each other, enrich the soldiers, and scorn all other men.”
Caracalla ignored the first command immediately. Returning to Rome as co-emperors who despised each other so intensely that they divided the Imperial Palace on the Palatine Hill in half with bricked-up doorways and rival bodyguards, the two brothers lasted barely ten months together. In December 211 AD, Caracalla lured Geta into their mother Julia Domna’s private apartments under the pretext of a peace reconciliation. The moment Geta stepped inside unarmed, Caracalla’s centurions burst in and hacked the younger brother to death as he clung to his mother’s neck, soaking Julia Domna’s robes in blood and even slicing her hand in the struggle.
To erase his crime, Caracalla unleashed the most sweeping damnatio memoriae in Roman history against his dead brother:
- Total Erasure: Speaking or writing Geta’s name became a capital crime, every coin bearing Geta’s face was melted down, and his portrait was chiseled off every monument from Britain to Egypt—including the surviving Arch of the Argentarii in Rome.
- Purge of Supporters: Over the following weeks, Caracalla executed an estimated twenty thousand of Geta’s friends, guards, palace attendants, and critics, including the Empire’s greatest legal scholar, the Praetorian Prefect Papinian, who refused to write a speech justifying the fratricide by declaring that it was far easier to commit parricide than to excuse it.
The Edict of Caracalla (212 AD): Citizenship and Taxes
Prior to 212 AD, the sixty million inhabitants of the Roman Empire were divided into a strict legal hierarchy: a privileged minority of cives Romani (Roman citizens, living mostly in Italy and provincial colonies) and the vast majority of peregrini (free provincial subjects in Gaul, Spain, Greece, Syria, Egypt, and North Africa who paid direct poll and land taxes without enjoying the legal protections of Roman civil law).
In 212 AD, Caracalla issued the Constitutio Antoniniana (the Edict of Caracalla), preserved partially on the Giessen Papyrus. With a single stroke, Caracalla declared that all free men throughout the Roman world were henceforth Roman citizens, and all free women held the exact legal rights of Roman matrons. Millions of newly enfranchised provincials gratefully adopted the emperor’s family name, Aurelius, transforming the empire from an Italian conquest state into a unified commonwealth.
Why did a brutal military dictator suddenly grant universal citizenship? While Caracalla’s edict boasted that he wanted to thank the gods for saving him from his brother’s “conspiracy” by bringing millions of new worshippers to the state altars as citizens, the cynical contemporary historian Cassius Dio pointed out the cold financial motive behind the generosity:
- The Inheritance Tax Loophole: Under Roman law, non-citizens (peregrini) were exempt from paying the five-percent tax on inheritances (vicesima hereditatium) and the five-percent tax on freeing slaves.
- Doubling the Rate: At the exact same moment Caracalla turned every provincial millionaire into a Roman citizen, he doubled both tax rates from five percent to ten percent—instantly creating a massive windfall of cash to pay the skyrocketing wages he had promised his soldiers.
The Baths of Caracalla and Death by the Roadside
To win the love of the urban plebs of Rome despite his terror against the Senate, Caracalla constructed the magnificent Baths of Caracalla (Thermae Antoninianae) at the foot of the Aventine Hill. Covering over sixty acres and accommodating sixteen hundred bathers at a time inside vaulted halls lined with granite columns from Egypt, mosaic floors, two public libraries, olympic-sized swimming pools, and underground furnace tunnels operated by hundreds of workers, the complex stood as one of the greatest engineering marvels of antiquity.
Obsessed with believing he was the reincarnation of Alexander the Great, Caracalla marched east in 215 AD to invade the Parthian Empire. After ordering a treacherous massacre of thousands of unarmed youths in Alexandria, Egypt, simply because the locals had mocked his short stature and his murder of Geta, Caracalla marched into Mesopotamia. There, on April eighth, 217 AD, while riding between Edessa and the Moon Temple at Carrhae, the twenty-nine-year-old emperor dismounted from his horse to relieve himself privately by the side of the road. As his guards turned their backs out of respect, a disgruntled soldier named Justin Martialis—secretly recruited by the fearful Praetorian Prefect Macrinus, who had intercepted a prophecy naming him the next emperor—stepped forward and drove a dagger into Caracalla’s collarbone, ending the reign of the tyrant who accidentally united the Roman world.
