English might be a Germanic language, and I knew it was, but it's so influenced by Latin it practically doesn't deserve the title.
And how did Roman science survive because of the Mongols? It survived because it's own scholars recorded it, which, by the way, the Mongols did little recording of their own history. The Mongols never even got to the Italian peninsula, so how could they keep Rome's science alive? The Mongol's one claim to fame was their bow. The Romans made a new language category, affected the entire history of Europe, and even made not one, but two ages (First was the Romanesque/classical age, second was the Dark Ages which came around because of it's fall). The Mongol's empire didn't even last 100 years before it split up; the Roman Empire lasted in it's entirety for about 500 years, plus the Roman Republic makes 1000 years.
And you said yourself some historians recognize the Mongol Age; every historian recognizes the Classical and Dark Ages.