Rat ridder (4,5)
I believe the answer is:
pied piper
(Other definitions for pied piper that I've seen before include "Hamelin ratcatcher" , "He led children astray in Hamelin" , "Legendary German musician who lured away rats and children in Hamelin" , "One who lured" , "Leader (from Hamelin?) who entices people to follow him to their doom" .)