In the story of The Princess Bride, Yellin is the Chief of All Enforcement in Florin City. He and his cousin, the albino, are the only two commoners that Prince Humperdinck trusts. He's a small and crafty man who's very loyal to Humperdinck, but he becomes increasingly distraught and confused when Humperdinck insists that Guilder plans to kill Buttercup and invade Florin, as there's no evidence that this is true. Finally, on the night of the wedding, Yellin tries to hand in his resignation, but reaffirms his loyalty to Humperdinck when Humperdinck finally lets him in on his ruse: he's trying to frame Guilder to start a war.