Read more about The Horned King at: Wikipedia
Official Site: Disney
In the book series, he appears only in the first book, The Book of Three. He is Arawn's champion and the War Leader of Annuvin. The Horned King is described as a huge man wearing armor (except for his arms, which are naked and stained crimson), a red cape and an antlered skull mask. The antlers are presumably where he gets his name.
Arawn sends the Horned King to capture the pig Hen Wen from Caer Dallben. He follows Taran across Prydain in search of the oracular pig Hen Wen, but cannot find her. In the end, he marches his army to Caer Dathyl and attacks Taran when he and Eilonwy try to warn the Sons of Don of the impending attack. Taran tries to fight him with the sword Dyrnwyn, but is nearly slain by the sword's fire in his attempt to draw it. Gwydion is able to defeat the Horned King by speaking his true name, which is never revealed; upon the utterance of his name, the Horned King is struck by a lightning blast and consumed by flames.
The animated Disney film The Black Cauldron combines scenes from the first two books, and uses the Horned King in place of Arawn as the movie's prime antagonist. He looks quite different in the movie; the antlers remain, but he wears a red hooded robe. Instead of a normal human, he appears to be an undead, skeletal creature whose eyes glow red upon being angered or excited (a lich) and is more on par with a sorcerer. He was voiced by John Hurt.
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