What is the name of the villain in "The Black Cauldron"?

The villain in “The Black Cauldron” is the Horned King.

He seeks the Black Cauldron, a sinister magical relic capable of creating the Cauldron-Born, an army of undead warriors. His goal is world conquest, making him the film’s central antagonist rather than merely a powerful henchman or monster.

Taran encounters the Horned King while trying to protect Hen Wen, an oracular pig whose powers can help locate the cauldron. The Horned King captures Taran and later uses the cauldron to raise his undead army. In the climax, the cauldron’s destructive power turns against him and drags him to his death.

The 1985 Disney film adapts material from Lloyd Alexander’s Chronicles of Prydain novels, although the movie substantially reshapes the character. The Horned King is sometimes confused with villains such as Maleficent because of his imposing fantasy design, but Maleficent belongs to Sleeping Beauty. The film was also notable as Disney’s first animated feature to receive a PG rating.