Septimius Severus died in 211 while campaigning in Britain. He left the Empire to his sons, but their mutual hatred for one another meant that one of them was going to wind up dead.
The History of Rome - 101- And All Was of Little Value
After defeating Clodius Albinus, Septimius Severus turned over daily administration of the Empire to his Praetorian Prefect Gaius Plautianus, while the Emperor himself went looking for further military vicotries in Parthia.
the memory palace - Episode 32 (Gigantic)
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