She was emperor of the Roman Empire between October 13, 54 and June 9, 68, last emperor of the Julio-Claudian dynasty.  He acceded to the throne upon the death of his uncle Claudius, who had previously adopted and named him as his successor over his own son, Briton.

 His reign is commonly associated with tyranny and extravagance.  He is remembered for a series of systematic executions and for the belief that while Rome burned, he was composing on his lyre and persecuting Christians.
(From Fate)