I agree with Encaitare. In English, "mightiest" could mean either singular or plural. From the context of the passage, it seems to me that more than one person is meant.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth.. .'
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