Bombadil.
About Treebeard's knowledge, from Letter No. 153:
Quote:
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Treebeard is a character in my story, not me; and though he has a great memory and some earthy wisdom, he is not one of the Wise, and there is quite a lot he does not know or understand. He does not know what 'wizards' are, or whence they came.
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...take counsel with thyself, and remember who and what thou art.
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