I would say the Hittites and the Celts. The Hittites thrived and disbanded before the beginnings of the Roman empire. The Celts were absorbed by the Romans but were keen to follow their ways.
Answer:
This proclamation legalized Christianity and allowed for freedom of worship throughout the empire. For a time, Constantine stood by as others ruled the Eastern Roman Empire.
Is this part of a story because theres no evidence to show how you would know
There are so many reasons, high taxes (especially on bread), forced military services, and the power of the higher class