This is too much to manage. I will split the empire into 2 sides.
The fall of Romeby: Liliana Burzler
western side
eastern side
Another problem was that there was no clear system for the passage of power from one empire to another. After the emperor died, there was no longer a clear heir.
A problem that caused the fall was that the wealth of the eastern side was the reason the western side was standing.
Another problem was that Rome was ruling an extensive empire with a government designed to run a small city-state.