I often have difficulty using the verb 'be' in the proper tense when I refer to
a historical figure.

1) Who was the most important person in American history?
2) Who is the most important person in American history?

3) Was King Arthur a historical person?
4) Is King Arthur a historical person?

Would you tell me which sentences sound natural? And why?

Thanks in advance.

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Between 1 and 2, I would use 2 - it refers to a modern idea of who is the most important person. 1 makes it sound like they were the most important, but aren't anymore. Between 3 and 4, I would use 3 - the past tense sounds more natural because you're referring to someone who is long dead. Even though he has a place in history, using the present tense almost makes it sound like you're referring to a modern day person.