Answer: the fall of roman civilization led to creation of the term dark ages for this period of history. Rome was sacked for the first time in 400 years in the year 410, in the meantime ostograths in italy removed the last roman emperor Romulus thus ending the roman empire. All the things that romans had created came to an end, the roads, social welfare system, monuments etc. This was followed by the arab invasion and later the vikings invasions. History of this period ceased to be recorded anymore, thus the middle ages are known as dark ages because of fall of roman empire and the literal darkness [ the absence of records].
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