Constantine moved the capital of the Roman Empire because of how dangerous it was to live in.
The fall of Ancient Rome started from about AD 190. The Roman Empire was attacked by tribes such as the Goths and the Vandals. Civil wars in parts of the empire further weakened the rule of Rome and respect for Roman law dwindled as a result.
I'm no expert on this, but I would say conquoring other lands and kingdoms. Going into battles and winning. Taking over cities, and stealing their items. They were very powerful back then, and demanded respect.
~Silver
How wide is the Amazon river at its widest point
<span>I think it is pharaoh</span>