'A historical' would be the correct way to say it. Some people don't pronounce the 'h' at the beginning of historical and use 'an' instead of 'a' before it. But I think that's a bit old-fashioned.
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GuestUse "a" if the next word begins with a consonant, and "an" if the next word begins with a vowel. A tiger, an angel, a book, etc. A historical character.This is not completely correct.