Final answer:
The Roman Empire fell in the 5th century, with the fall of Rome in 476 AD as a significant event. Its decline started in the 3rd century due to various factors.
Step-by-step explanation:
The Roman Empire is generally considered to have fallen in the 5th century. The exact year or century can be debated, but many historians point to the event of the fall of Rome in 476 AD as the end of the Roman Empire. However, it is important to note that the decline of the Roman Empire began much earlier, in the 3rd century AD, due to a combination of internal and external factors.
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