Good old monotheism - the key to Europes 12 centuries of intellectual numbness.
From wiki:
In 529 the Byzantine emperor Justinian closed all of the pagan philosophical schools (the year 529 is now taken to be the beginning of the medieval period). Most scholars fled the West towards the more hospitable East, particularly towards Persia, where they found haven under King Chosroes and established what might be termed an "Athenian Academy in Exile". Under a treaty with Justinian, Chosroes would eventually return the scholars to the Eastern Empire. During the dark ages, European mathematics was at its nadir with mathematical research consisting mainly of commentaries on ancient treatises; and most of this research was centered in the Byzantine Empire. The end of the medieval period is set as the fall of Constantinople to the Turks in 1453. The twelfth century saw a flood of translations from Arabic into Latin....
I'd say it was the rise of an intolerant monotheism that precipitated the Dark Ages and it was the fall of this monotheism that prompted the Renaissance.
From wiki:
In 529 the Byzantine emperor Justinian closed all of the pagan philosophical schools (the year 529 is now taken to be the beginning of the medieval period). Most scholars fled the West towards the more hospitable East, particularly towards Persia, where they found haven under King Chosroes and established what might be termed an "Athenian Academy in Exile". Under a treaty with Justinian, Chosroes would eventually return the scholars to the Eastern Empire. During the dark ages, European mathematics was at its nadir with mathematical research consisting mainly of commentaries on ancient treatises; and most of this research was centered in the Byzantine Empire. The end of the medieval period is set as the fall of Constantinople to the Turks in 1453. The twelfth century saw a flood of translations from Arabic into Latin....
I'd say it was the rise of an intolerant monotheism that precipitated the Dark Ages and it was the fall of this monotheism that prompted the Renaissance.