Cassius Dio's Rome and the Praetorian Guard

Cassius Dio says that he tries to correct many of the irregularities introduced by Eligablas. He's very unpopular with the populace, so Cassius Dio talks about a three day riot and conflict between the people of Rome and the Praetorians in the reign of severis Alexander. The murderer of Ulpian is actually a man called Aurelius Epagathus. We don't know how this happens, but he is responsible for killing Ulpian despite the fact thatUlpian is taken shelter in the Imperial Palace.