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, the "Assistant Pig-Keeper", and his companions. Princess Eilonwy, the latest enchantress to be born of the House of Llyr, "faces the unavoidable (and in her view absolutely unnecessary) ordeal of becoming a young lady." The young hero Taran accompanies her on her journey to the royal court of the Isle of Mona, the same island where her ancestral home was located, and where she will continue her education as a princess. Soon after her arrival, she is kidnapped by agents of the evil sorceress Achren, who wishes to use her for as part of a plan for domination. During the adventure, more is revealed of Eilonwy's heritage and her family's former home, the castle Caer Colur. Source: Wikipedia (en)