Actually, I wonder if the anti-Aryan riots that resulted in the burning of the libraries of Alexandria in the 4th century could be blamed for the rise of Islam, ironically.
Here’s how:
Islam is actually a fusion of Bedouin folk religion and the Aryan heresy of Christianity, which was popular throughout much of North Africa and the Middle East. The center of civilization for the Aryan heresy was Alexandria. Due to Rome tossing in on the side of the Orthodox (”correct”) /Catholic (”universal” in the sense of being “objectively knowable”) Church, there was strong tension between Aryans and Rome.
There was a great decline in Aryan scholarship. Was this due to the loss of the great Aryan learning center and de-facto intellectual capitol? With the decline in scholarship, the folk weren’t converted to Orthodox / Catholic Christianity, they just became less educated and less organized. Did this ignorance (and perhaps a grudge from the anti-Aryan riots) enable Islam to drive out the last vestiges of Catholic thought?