This will be about the books and the movie with some occasional detours about who was involved from Lloyd Alexander himself to the animators who worked in the Disney version and I may even do some Katzenberg if I'm ever feeling nice enough to talk about how much I blame him for everything that's wrong with the movie.
Assistant Pig-Keeper(s)

The Chronicles of Prydain (sometimes given as The Prydain Chronicles) is a five-volume series of children's fantasy novels by author Lloyd Alexander. First published from 1964–1968, the stories detail the adventures of a young man named Taran, who is awarded the honor of Assistant Pig-Keeper but dreams of being a grand hero, and his companions Princess Eilonwy, Fflewddur Fflam the wandering bard and king, a feral yet gentle creature called Gurgi, and a dwarf named Doli.

The Black Cauldron (movie) is a 1985 American animated fantasy film produced by Walt Disney Feature Animation and originally released to theatres on July 24, 1985. The twenty-fifth animated feature in the Walt Disney Animated Classics, the film is based on Lloyd Alexander's The Chronicles of Prydain book series, which is in turn based on Welsh mythology.