If you mean the fall of the Roman Republic, that and the succeeding decadence of the Empire was covered in detail by Roman sources. The Annals of Tacitus are ju

If you mean the fall of the Roman Republic, that and the succeeding decadence of the Empire was covered in detail by Roman sources. The Annals of Tacitus are just one of many examples. [0] It's how we know what happened. [0] https://en.wikipedia.org/wiki/Annals_(Tacitus) https://en.wikipedia.org/wiki/Annals_(Tacitus)