The reason for the introduction of the accented 'I' in later editions of The Lord of the Rings is not entirely clear. It first appears, at least in English, in the carefully revised 2005 edition, but where the editors of that edition, Wayne G. Hammond and Christina Scull, are typically scrupulous in explaining their revisions in their Reader's Companion, this particular change goes unremarked. Presumably it is intended to follow the conventional Old English īren (with a macron marking a long 'i') for 'iron' rather than unaccented iren, which would be pronounced with a short 'i' sound.
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