We know that the dawn of the age of Renaissance and the dusk of the Middle Ages were accelerated by the fall of Byzantine Empire and the transfer of a big chunk of "Ancient Knowledge" from Greece to Italy, since many scholars fled from the Arabs/Turks there.
But what about the "Ancient Knowledge" in the Western half of the Roman Empire? I am aware of the fact that Western Roman Empire fell around 450, while Eastern Roman Empire fell around 1450. But what happened to all the scholars and sciencists of Western Rome during the Barbarian Invasions? Did they left for another part of Europe? As we know, dark times followed upon Italy since the fall of Rome until the Renaissance when it comes to science.