The Guild of Harness Polishers was an organisation active in Camelot. Shortly after becoming King of Camelot, Arthur had to give a speech to the guild, much to his dismay, which Merlin decided to help him write. Upon hearing of this duty to speak to the Guild of Harness Polishers, Arthur said that he did not know anything about polishing. Fortunately, Merlin did and wrote the speech for him, but it was so extensive Arthur believed it would take hours to learn (The Secret Sharer) and told Merlin that his speech needing polishing!