Nero is one of the more famous Roman Emperors, but not because he was a great leader. Just the opposite. He became famous because he was insane. Nero wasn't insane when he became emperor. He slowly became insane while he was emperor.
Over time, Nero became murderously insane. he had hundreds of people killed for no reason other then they caught his eye. He even ordered some leaders of the Roman senate to kill themselves. This drove the Senate to action. They tried to arrest Nero. When Nero found out they were coming for him, he committed suicide.