Western Rome had pretty bad 3rd century as well. Luckily there were no serious contenders around. [1] As for Eastern Roman Empire it lasted for several centur

Western Rome had pretty bad 3rd century as well. Luckily there were no serious contenders around. [1] As for Eastern Roman Empire it lasted for several centuries but after VII/VIII century and loss of Africa, Egypt, Syria (main sources of manpower and grain) it became only local power at best. [1] https://en.wikipedia.org/wiki/Crisis_of_the_Third_Century#:~:text=The%20Crisis%20of%20the%20Third,rebellions%2C%20political%20instability%20(with%20multiple https://en.wikipedia.org/wiki/Crisis_of_the_Third_Century#:~...