The Renaissance of the 12th Century

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Part of a continuing effort to fight the idea of "Dark Ages" by extending the Renaissance back further and further rather than just pointing out that the Dark Ages were a flawed and propagandistic concept to begin with?  (See also: Carolingian Renaissance of the 9th century)

It depends on where you were how much of an effect thee was. After all, the Roman empire lasted until 1453 in Constantinople.