The Black Cauldron (object)

Arawn was an evil overlord in the Chronicles of Prydain books by Lloydd Alexander. He was replaced by the Horned King in The Black Cauldron because the animators felt that people would like the Horned King better since he had horn (similar to Maleficent and Chernobog). However, Arawn did recieve a part in the movie. During the prologue, the narrator talks about the history of the Black Cauldron and how Arawn came to become it.

As stated in the prologue: "Legend has it, in the mystic land of Prydain, there was once a king so cruel and so evil, that even the gods feared him. Since no prison could hold him, he was thrown in to a mold of molten iron. Ther his demonic spirite was captured in the form of a great Black Cauldron."