Charlemagne was not called "the meteor in dark midnight." That phrase is not a known historical nickname or description of him.

It's possible you're thinking of a different figure or that the phrase is from a fictional work.

Here are some of Charlemagne's more common titles and epithets:

* Charles the Great: This is his most common name, given to him after his coronation as Holy Roman Emperor in 800 AD.

* Father of Europe: This title reflects his role in unifying much of Western Europe under his rule.

* The Emperor of the West: This refers to his position as the first Holy Roman Emperor since the fall of the Western Roman Empire.

If you can provide more context about where you encountered the phrase "meteor in dark midnight," I might be able to help you understand its origin better.