"And the marvellous rose became crimson, like the rose of the eastern sky. Crimson was the girdle of petals, and crimson as a ruby was the heart"

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In the earlier novels, Steve King tells us that John Farson, and perhaps even the Crimson King himself, are but other names and faces that belong to Walter O'Dim. However, in The Dark Tower, he tells us very clearly that Walter, John Farson, and the Crimson King are actually separate individuals.

— Robin Furth