Rome, multiple times before the western empire actually fell. I’m not an expert, but roughly there was a major civil war about once a century (or more), a transition from a republic to an empire, the experiment with the tetrarchy, and a major change in state religion.
They didn’t entirely “reverse course”, the society changed and evolved at each point, but it remained recognizably Roman. And that’s just the western empire.
They didn’t entirely “reverse course”, the society changed and evolved at each point, but it remained recognizably Roman. And that’s just the western empire.