It is all relevant to the notion of "Dark Ages" as an explainer for the development of humanity at the time, when in fact this is just Western ignorance to the rest of the world, as has been discussed in the subsequent comment chain. It is the same ideology that ignores all the human achievements outside of Europe at that time, that then goes to rob cultural and historical heritage of the people that had been more advanced at that time and declare these non white people as barbarians.

These aspects are fundamentally linked together in a larger racist imperial ideology and it is important to understand and challenge that ideology to challenge its revision of history. Anyways, i'll be doing some al-jabr mathematics now.