Question: Princess Eilonwy, is a fictional character in Lloyd Alexander's "The Chronicles of Prydain", she also appears  in four of the five novels in the series, as well as Disney's 1985 animated film adaptation of which 1985 American animated dark fantasy adventure film?

full_context: Document 1: Princess Eilonwy: Princess Eilonwy, later known as Queen Eilonwy ( ), is a fictional character in Lloyd Alexander's "The Chronicles of Prydain". She appears in four of the five novels in the series, as well as Disney's 1985 animated film adaptation "The Black Cauldron". Eilonwy is a member of the Royal House of Llyr, and the women in her line are formidable enchantresses, including her mother Angharad and grandmother Regat. She has inherited this characteristic, most readily visible in her manipulation of a magical item she calls her "bauble", a small golden sphere that glows with magical light when activated by her willpower. Eilonwy's father, Geraint, was a commoner with whom her mother fell in love.
Document 2: Lady of the Green Kirtle: The Lady of the Green Kirtle, also called Queen of Underland and Queen of the Deep Realm, is the main antagonist in "The Silver Chair" by C. S. Lewis. She is sometimes called briefly the "Green Lady" (on analogy with Jadis, the "White Lady"), and she is known also as the "Emerald Witch"; neither name, however, appears in Lewis's text. She enslaved Prince Rilian of Narnia and a horde of gnomes by her witchcraft, and planned to use them to take over Narnia. She is foiled by three friends of Aslan: Eustace Scrubb, Jill Pole, and Puddleglum.
Document 3: The Black Cauldron (film): The Black Cauldron is a 1985 American animated dark fantasy adventure film produced by Walt Disney Feature Animation in association with Silver Screen Partners II and released by Walt Disney Pictures. The 25th Disney animated feature film, it is loosely based on the first two books in "The Chronicles of Prydain" by Lloyd Alexander, a series of five novels that are, in turn, based on Welsh mythology.
Document 4: Lloyd Alexander: Lloyd Chudley Alexander (January 30, 1924 – May 17, 2007) was an American author of more than forty books, primarily fantasy novels for children and young adults. His most famous work is "The Chronicles of Prydain", a series of five high fantasy novels whose conclusion, "The High King", was awarded the 1969 Newbery Medal for excellence in American children's literature. He won U.S. National Book Awards in 1971 and 1982.
Document 5: Gwystyl: Gwystyl is a character in Lloyd Alexander's fantasy "Chronicles of Prydain" book series. He first appears as one of the Fair Folk in the second novel of the series, "The Black Cauldron". He also makes an appearance in the fifth and final novel, "The High King."
Document 6: The Black Cauldron (novel): The Black Cauldron (1965) is a high fantasy novel by Lloyd Alexander, the second of five volumes in "The Chronicles of Prydain". For 1966 it was a Newbery Honor book, runner-up for the year's "most distinguished contribution to American literature for children".
Document 7: The Two Princesses of Bamarre: The Two Princesses of Bamarre is a 2001 novel by Gail Carson Levine, the author of Ella Enchanted and several other books. The story revolves around the lives of two sisters who are very close, but as different as night and day. When one of them falls victim to a deadly disease sweeping the kingdom, the other must find the courage to discover the cure and save her sister.
Document 8: The Chronicles of Prydain: The Chronicles of Prydain is a pentalogy of children's high fantasy Bildungsroman novels written by American author Lloyd Alexander. Henry Holt published one annually from 1964 to 1968; the second earned a 1966 Newbery Honor and the last won the 1969 Newbery Medal.
Document 9: The Book of Three: The Book of Three (1964) is a high fantasy novel by Lloyd Alexander, the first of five volumes in "The Chronicles of Prydain". The series follows the adventures of Taran the Assistant Pig-Keeper, a youth raised by Dallben the enchanter, as he nears manhood while helping to resist the forces of Arawn Death-Lord.
Document 10: Taran (character): Taran is a fictional character from Lloyd Alexander's "The Chronicles of Prydain" series of novels. Serving as the series's central protagonist, he is first introduced as the assistant pig-keeper at Caer Dallben charged with the care of Hen Wen, the oracular white pig. With dreams of becoming a great hero, over the course of the series, his character matures as he is drawn into the war against Arawn Death-Lord and his champion, the Horned King.
Document 11: Aurora (Disney): Aurora (also known as Sleeping Beauty or by her alias "Briar Rose") is a fictional character who appears in Walt Disney Pictures' 16th animated feature film "Sleeping Beauty" (1959). Originally voiced by singer Mary Costa, Aurora is the only daughter of King Stefan and Queen Leah. As revenge for not being invited to Aurora's christening, an evil fairy named Maleficent curses the newborn princess, foretelling that she will die on her 16th birthday by pricking her finger on a spinning wheel's spindle. Determined to prevent this, three good fairies raise Aurora as a peasant in order to protect her, patiently awaiting her 16th birthday – the day the spell is to be broken by a kiss from her true love, Prince Phillip.
Document 12: The Castle of Llyr: The Castle of Llyr (1966) is a high fantasy novel by Lloyd Alexander, the third of five volumes in "The Chronicles of Prydain". The story continues the adventures of Taran "Assistant Pig-Keeper", primarily on the Isle of Mona west of Prydain, far from the forces of Arawn, Lord of Death.
Document 13: Fflewddur Fflam: Fflewddur Fflam, son of Godo, is a cantrev lord in the fictional country of Prydain in Lloyd Alexander's Chronicles of Prydain. He is referred to as a King, but makes it perfectly clear that he is a very minor king of a tiny kingdom at best, much less important than the High King who is the ruler of Prydain. His kingdom is described as being dreary and dull. As a result, he often leaves it to go wandering about as the world's most unofficial bard in the mystical land of Prydain. Though he returns from time to time to rule, he once mentions that he gets the feeling that the people of his country get along just fine even if he is not there.
Document 14: Ella Enchanted: Ella Enchanted is a Newbery Honor book written by Gail Carson Levine and published in 1997. The story is a retelling of "Cinderella" featuring various mythical creatures including fairies, elves, ogres, gnomes, and giants. In 2006, Levine went on to write "Fairest", a retelling of the story of Snow White, set in the same world as "Ella Enchanted". On April 9, 2004, a movie loosely based on the novel was released. It was directed by Tommy O'Haver and starred Anne Hathaway and Hugh Dancy as Ella and Prince Charmont, respectively. The film received mostly mixed reviews, and was heavily criticized for its changes to the source material. Levine stated that the film is "so different from the book that it's hard to compare them," noting the addition of new characters such as Sir Edgar and Heston, and suggested "regarding the movie as a separate creative act".
Document 15: Taran Wanderer: Taran Wanderer (1967) is a high fantasy novel by Lloyd Alexander, the fourth of five volumes in "The Chronicles of Prydain". The series follows Taran, the Assistant Pig-Keeper, as he nears manhood while helping to resist the forces of Arawn Death-Lord.
ground_truth: The Black Cauldron