The Prince Who Worked as Satan's Servant and Saved the King from Hell (Lithuanian: Apė karaliūnaitį, kur pas šėtoną slūžyjo ir karalių išgelbėjo iš peklos) is a Lithuanian fairy tale collected by German linguists August Leskien and Karl Brugmann. Andrew Lang included it in The Grey Fairy Book under the title The Magician's Horse.