Which Roman emperor considered himself a great poet and actor, but in fact was a cruel and bloodthirsty ruler?

The Roman emperor Nero was extremely cruel, marked by the bloody suppression of Christian communities on the territory of the empire, palace intrigues and conspiracies. But the greatest atrocity that Roman chroniclers attribute to Nero is the burning of Rome to inspire the emperor. As the sources describe, he watched the burning city and sang songs. When he was killed by his servants, he said before his death that the great actor is dying.