Analysis of information sources in references of the Wikipedia article "Dark Ages (historiography)" in English language version.
Petrarch was the very first to speak of the Middle Ages as a dark age, one that separated him from the riches and pleasures of classical antiquity and that broke the connection between his own age and the civilization of the Greeks and the Romans.
The Dark Ages and the Middle Ages — or the Middle Age — used to be the same; two names for the same period. But they have come to be distinguished, and the Dark Ages are now no more than the first part of the Middle Age, while the term mediaeval is often restricted to the later centuries, about 1100 to 1500, the age of chivalry, the time between the first Crusade and the Renaissance. This was not the old view, and it does not agree with the proper meaning of the name.
In terms of the sources of information available, this is most certainly not a Dark Age.... Over the last century, the sources of evidence have increased dramatically, and the remit of the historian (broadly defined as a student of the past) has expanded correspondingly.
In the course of recent decades, the very expression 'Dark Ages' has fallen into disrepute among historians.
According to widespread popular belief, the period of European history known as the Middle Ages was a time of barbarism, ignorance and superstitious. The epithet 'Dark Ages' often applied to it nicely captures this opinion. As for the ills that threatened literacy, learning, and especially science during the Middle Ages, blame is most often laid at the feet of the Christian church...