In a small dictatorship, the boss might hold a title like "The President and the Leader for Life." Would the following sentence take singular or plural verb?
The President and Leader for life request/requests your immediate presence.
How about the sentence:
The President and the Leader for Life is/are one and the same person.
My opinion is that either works, but I don't even know what to search in the style manuals.
And I don't mean to restrict to formal titles. I'd like to know about a sentence like, "The guy you hate so much and the guy sending you flowers are/is one and the same." Or "Batman and Bruce Wayne is/are the same person."