Comment by User23

The thing is that’s not really true. Fibonacci is one you’ve heard of, but there are plenty of other great medieval European mathematicians, such as Oresme, de Nemore, Wallingford, and Bradwardine.

Oddly, there does seem to be something of a long running fad among popular historians to downplay the achievements of the middle ages. None of that of course is to say that the collapse of the empire in the west wasn’t devastating, especially in the early middle ages.