10 of the worst Roman Emperors in history.

Domitian

The Apocalypse of Saint John is believed to have been written during Domitian’s reign at the end of the First Century. Domitian was a staunch advocate for the Roman gods and goddesses, the worship of whom had fallen out of practice by the time of his rise to power.
Eusebius of Caesarea, writing 300 years later, recounts that the first large-scale Christian and Jewish persecution began during Domitian’s reign. There is no non-Christian history of such activities, but Domitian is known to have been tyrannically opposed to all other religions other than Roman.
Like so many other emperors, Domitian dealt with dissent among his close Advisors and friends by means of death. He executed a few too many prominent politicians and wealthy citizens, and the straw that broke the camel’s back was his murder of his secretary, Epaproditus.
A man named Stephanus, and several others, conspired to kill him, with Stephanus pretending to be wounded for several days, so he could conceal a dagger under his bandages. He approached Domitian in his bedroom, and stabbed him in the groin, whereupon the emperor was beset by several men, one of which was a fearsome gladiator, who all stabbed him to death.