Also interesting is that he was succeeded by Caracalla and Geta - brothers. They couldn't stand their father's advisors, so had them all beheaded. A recent excavation in York discovered a Roman cemetery with about 30 bodies buried with their heads between their knees - presumed to be Septimus Severus's advisors.
Geta didn't last long - murdered probably on the orders of his brother. Caracalla only made it another 5 years before too was murdered.
Who would be emperor in those days!