Nero

I think that Nero was definitely corrupted by power. Since he was born into power he took it for granted and his actions did not seem like a big deal to him. When someone got in his way or had any chance at overpowering him, he simply organized an accident to kill them off. Even though I believe that power corrupted him, he had some sort of evil nature within him. For one, he had his own mother killed, and second he was a criminal at night, robbing and attacking his own citizens. Perhaps he felt like the all of Rome was his to do whatever he wished, like burn it down, but this was all due to his power that was not a privilege to him, but a right.