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Originally the term characterized the bulk of the Middle Ages, or roughly the 6th to 13th centuries, as a period of intellectual darkness between extinguishing the "light of Rome" after the end of Late Antiquity, and the rise of the Italian Renaissance in the 14th century. This definition is still found in popular use, but increased recognition of the accomplishments of the Middle Ages has led to the label being restricted in application. Since the 20th century, it is frequently applied to the earlier part of the era, the Early Middle Ages (c. 5th–10th century).
Так что именно V-X вв.