"BTW Why was the Dark Age called the Dark Age?"
Well, I'd guess it wasn't because it was dark all the time. It's called the "Dark Age" because it was - wait for it - unenlightened (i.e, knowledge and education were suppressed and restricted to very few). The Age of Enlightenment followed the Dark Ages.
No, the Renasaince followed the Dark Ages. Enlightenment was in the 17-18th century.
>> (i.e, knowledge and education were suppressed and restricted to very few) <<
The printing press in the third century, but Exxon-Mobil bought it up and kept it from coming to market so it wouldn't drive down the price of quills.