Nero was a madman.
Seneca (with Afranius Burrus) told him: "Kill your mother, it's better". Few days later Agrippina drown...
Then Nero stop listening to Seneca and made him kill himself, after having killed the whole Pisoni family.
When the Spanish soldiers chose Galba as new emperor Nero stabbed himself and gave the world a big house in the centre of Rome (the Domus Aurea, built after the great fire of Rome -- probably ordered by Nero himself).
(This ancient tale looks like The Sopranos or The Godfather, doesn't it?)