You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: FICTIONAL CHARACTERS 
Clue: According to the Browning poem, he could also get rid of "The mole and toad and newt and viper"
the pied piper of hamelin