The Carolingian "Renaissance"/era is one of the coolest "ties-it-all-together" threads in history.
Foremost of the era, the grandson of CHARLES "THE HAMMER" MARTEL himself (that's the dude who straight up miraculously stopped Islam in its tracks in Tours, France), was none other than Charlemagne.
"David" (as some of his cheeky monks would call him) gathered to himself a retinue of nerds that he recruited from all over to re-discover the wisdom of the classical era and the early Church that'd been scattered. He succeeded in getting the Pope properly secured from the harassment of northern Italians. He stood up for Christian communities as no-one had against raiders who took advantage of their meekness and then spread Christianity all through Europe (slowly figuring out that forced conversions were of no use and backing martyr monks instead). In so doing essentially CREATING Europe as a thing. Charlemagne isn't called "the Father of Europe" in early sources for nothing. And he's just one dude among many properly incredible dudes in that era.
I don't know if there's a better adventure story, a more impactful little moment in time filled with more crazy characters and moral lessons learned that would come to shape our world today.
There were over a thousand years of struggle against Islam and barbarian Europeans still ahead, and Charlemagne's empire didn't last, but that's the moment the West first found its feet and European direction after hundreds of years of total chaos.
In desperation, the barbarian Franks had been entrusted with the wildly beleaguered western Christian Roman civilization. Charlemagne made good on that promise, that trust to bring Rome back to the fore. He allowed the West to find its feet again, such that it would remain standing even when all the East would eventually fall to Mohammedans.