Nero, or The Fall of Rome.

Roman emperor Nero is used to getting what he wants. He has grown tired of his wife Octavia, and has become infatuated with Poppea. He succeeds in making Poppea the new empress, but soon he faces opposition from an outraged populace. Informed of the danger of an imminent popular uprising, Nero orders to set fire to the city, which he watches from a terrace, rejoicing and playing his lyra.