To sum up the matter, it grew to be a widely diffused opinion that the Rev. Arthur Dimmesdale, like many other personages of special sanctity, in all ages of the Christian world, was haunted either by Satan himself or Satan’s emissary, in the guise of old Roger Chillingworth.
There are no more uses of "emissary" in the book.
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The president’s emissary says she aims to restart peace talks by the end of July.
The North Koreans want a high-powered U.S. emissary for the meeting.