On this date in 205, the Roman patrician Gaius Fulvius Plautianus was put to summary execution for aspiring to the purple.
Maternal cousin and longtime ally to Septimius Severus, Plautianus had helped himself to a generous slice of power and wealth when his friend became emperor. He got his bristly mug onto imperial coinage and even dynastically married his daughter to Severus’s nasty son and heir* Caracalla.
And so liberally did Plautianus wet his beak on the perquisites of this power that, Cassius Dio reports, “the populace in the Circus once exclaimed: ‘Why do you tremble? Why are you pale? You possess more than do the three.'” The three meant Severus himself and his two sons.
Severus for a time blithely ignored his friend’s aggrandizement, and Plautianus made the political personal by appropriating for himself the estates of numerous senators whose proscription he helped Severus implement.
But the enormous influence of his prefect soon began to present a threat that the emperor could not afford to ignore. In the coming years of the Third Century Crisis, this pattern would repeat itself with numbing regularity: the prestige of some figure would raise the prospect of his seizing the throne; the mere possibility would then thrust sovereign and potential usurper into a destructive mutual dash towards pre-emptive violence.
It’s anyone’s guess whether Plautianus was already contemplating a putsch as the natural progression of his authority, but the decision was made for him by the contempt with which Caracalla treated that daughter he’d been made to marry. The heir “was exceedingly hostile to the the girl, and to her father too,” and even “daily promised to kill her and her father as soon as he became sole ruler of the empire.” (Herodian of Antioch)
Resolving to strike before the young hothead was in a position to effect his threats, Plautianus allegedly engaged one of his loyal servants to assassinate the imperial family.**
The plot was instead betrayed, and Plautianus was produced before his former colleague to be handled as they had once handled those proscribed senators. After his immediate execution, his body was cast into the streets and Caracalla’s unwanted wife sent to a miserable exile.†
The History of Rome podcast covers the reign of Severus and the fate of Plautianus in episode 101, “And All Was of Little Value”.
* Co-heir, with his brother Geta — whom Caracalla murdered at the first opportunity after dear old dad died.
** The would-be assassin presented Severus with a written order for his death in the hand of his master. Cassius Dio quite justly suspects this a stitch-up: “These circumstances in particular betrayed the fraud; for Plautianus would never have dared to give such instructions either to ten centurions at once, or in Rome, or in the palace, or on that day, or at that hour, and especially not in writing.”
† Caracalla had his former wife murdered in 212.