I believe your subtext is incorrect - "most popular" is an inappropriate approach to take to correct usage. The correct usage, in either language, should be determined by which of the two roles is most relevant to the discussion.
South and Central America were never part of the Holy Roman Empire, so they were explored and conquered by and in the name of ...
Historians agree that historiographic reading of the documentary record of the past, may produce sustainable historical accounts.
They disagree on:
what constitutes the documentary record of the past.
what constitutes historiographic reading.
what a historical account is.
Historians do not agree that the past comprises facts. Nor do they agree that the ...
Emperor Charles V had many realms and many royal and noble titles. So he has different numbers with his name in different Wikipedia lists of monarchs.
As king of the Castilian kingdoms, he was Carlos I.
As king of Aragon, etc., he was Carlos I.
As king of Navarre he was Carlos IV, V, or VI since the list in Wikipedia is messed up. It counts a titular ...
This culture was distinct from modern Pueblo cultures in many respects, and in particular, was found in many ares where it no longer persists.
For a long period, this culture was known as the "Anasazi" culture, as noted in the Wikipedia article. This name was given them by the Navaho -- and means "ancient enemies." It was altered because the Puebloans did ...