The Carolingian Renaissance, the Scholastic revolution, the Italian Renaissance and the Sicilian School didn't fit into their liberal agenda - so they were ignored.
My Medievalist Professor hated the term “Dark Ages”. In any case it should never be taken as extending beyond 1100 or so. The 12th century was very exciting - intellectually speaking.
If I was in my peat home on the bog, I never knew anything about those things ... and no one bothered to tell me.