After the Roman decline, Western Europe entered a period of time with political, social and economic decline. It was politically divided and cut off from advanced places. There were also invaders. Trade and travel halted- it was unsafe to travel at that time. This period is called the Dark Ages.
Charlemagne united most of Western and Central Europe under the Carolingian Empire, which was the first new empire in Europe after the collapse of the Western Roman Empire.
The Middle Ages began after the collapse of the Roman Empire.
The civilisation of the Germanic peoples.
The civilisation of the Germanic peoples.
The Western Roman Empire was Western Europe
Roman*
the final collapse was due to worsening internal problems, the separation of the western empire from the wealthier eastern empire, and increasing outside invasions.
Western Europe (Eastern part of the Roman Empire did not collapse and became known as the Byzantine Empire) went into a period of chaos, then arose in the feudal society (Middle Ages)
.
The Dark Age.
Caligula had nothing to do with the collapse of the western Roman empire. He was only the third emperor and nothing he did could possibly affect events four hundred and thirty years in the future.
Nero's actions had nothing at all to do with the collapse of the Roman empire. He ruled roughly 300 years before the collapse.