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 History of Rome - 100- Black and White and Severus All Over
Septimius Severus became the undisputed Emperor of Rome after defeating Pescennius Niger in 194 and Clodius Albinus in 197.
The History of Rome - 099- What Evil Have I Done?
After buying the Imperial throne, Didius Julianus only remained in power for 66 days before being ousted by Septimius Severus.
The History of Rome - 098- Purchasing Power
After Commodus was assassinated, Pertinax reigned for 86 days. He was murdered by the Praetorian Guard in March 193 and the Imperial throne was auctioned off the highest bidder.
The History of Rome - 097- The Fall of Hercules
Commodus went off the deep end around 190 AD and was finally killed by his inner circle in 192.
The History of Rome - 096- The Most Aptly Named Emperor
The reign of Commodus turned on a botched assassination attempt orchestrated by his sister in 182 AD.
The History of Rome - 095- The Beginning of the End
Marcus elevated Commodus to the position of co-Emperor and then died a few years later while campaigning in the north.
The History of Rome - 094- Revolt and Meditations
In 175 Avidius Cassius led a brief revolt in the east that forced Marcus to postpone his final triumph along the Danube.
The History of Rome - 093- The Marcomannic Wars
The Romans fought a series of campaigns against a coalition of German tribes from 167-175. They were on the verge of total victory when news arrived of a rebellion in the east.