It is, of course, impossible to say when the Roman Empire started to fall. This is because it is hard to define what caused the fall of the Empire and when those processes started.
The Roman Empire is generally said to have fallen in 476 when a barbarian named Odoacer became the Emperor of Rome. However, many people argue that the Roman Empire continued to exist as the Byzantine Empire.
You could say that this process started in the 360s AD when the Empire was split between east and west. This led to a decline in the prestige of the city of Rome. This process was accelerated in 404 when the capital was moved to Ravenna for a while and was further accelerated when Rome was sacked in 410.
When did the Western Roman Empire begin to fall?
The fall of Rome is usually considered to have taken place in 476 A.D. when Odoacer, a minor German chief,...
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captured Rome and forced the emperor off his throne. But Rome began to decline centuries before that.
A time of peace and prosperity, known as the Pax Romana, began in 27 B.C. when Augustus became emperor and it lasted until 180 A.D. with the end of the reign of Marcus Aurelius. During the Pax Romana, the government of Rome was stable, and the Roman Empire grew in wealth and power. This came to an end in 180 A.D. when Commodus, the son of Marcus Aurelius, became emperor. The decline and the ultimate fall of the Roman Empire began with the end of the Pax Romana. The decline of the Rome continued when the Empire was permanently divided into the Eastern (Byzantine) Empire and the Western Roman Empire.
There were several reasons for the decline and fall of the Roman Empire. First, there were political reasons. There were no rules on who was to inherit the throne. This led to periods of civil war that plagued the Empire. Between 234 A.D. and 284 A.D. Rome had 26 different emperors. The division of the empire also hurt the western empire. The best generals and administrators were found in the east. Next, there were economic reasons. More and more money was needed by the emperors in order to pay the army and stay in power. This meant higher taxes which made Romans unhappy and less loyal to the Empire. In addition, no new lands were conquered depriving Rome of new revenues. Eventually, inflation became a big problem. The finally, there were foreign enemies. While Romans bickered and fought over politics and money, they left the frontiers open to invasion. It was the invasion and capture of Rome by Odoacer in 476 that is considered the fall of Rome.
The beginnings of the decline, or “falling”, of the Roman Empire could probably be traced back to the reign of Commodus and the end of the Pax Romana in 180 A.D.