Answer:
The decline of the Roman empire.
Step-by-step explanation:
1) The roman empire was a very vast and large empire. Due to that the governments couldn't handle that vast and large empire.
2) The vast empire also led to street thieves in little parts of the empire. This is because the governments were not able to look at every part of the empire.
3) Invasions of some barbarian tribes like the German tribes as well as tribes like the goths and the Huns.
4) The governments would give all the money to the army and soldiers so there wasn't any money left for the people who had jobs.
5) The poor people there went to the byzantine empire as they wanted justice and equality as there was no equality in the roman empire.