In medieval chivalric romance, the wizard often appears as a wise old man and acts as a mentor, with Merlin from the King Arthur stories being a prime example.[4]:195 Wizards such as Gandalf in The Lord of the Rings and Albus Dumbledore from Harry Potter are also featured as mentors, and Merlin remains prominent as both an educative force and mentor in modern works of Arthuriana.[5]:637[6] Other magicians, such as Saruman from The Lord of the Rings or Lord Voldemort from Harry Potter, can appear as hostile villains.[4]:193 Villainous sorcerers were so crucial to pulp fantasy that the genre in which they appeared was dubbed sword and sorcery.[5]:885