There are 5 books in the Chronicles of Pydain series. The newest book is The High King which came out in 1996.

Since The Book of Three was first published in 1964, young readers have been enthralled by the adventures of Taran the Assistant Pig-keeper and his quest to become a hero. Taran is joined by an engaging cast of characters that includes Eilonwy, the strong-willed and sharp-tongued princess; Fflewddur Fflam, the…

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The Castle of Llyr

The Castle of Llyr
Master Dallben has decided it is time for Eilonwy, daughter of the Royal House of Llyr, to learn to behave like a proper princess. He sends her away to the Isle of Mona but instead of training in the art of being a lady, Eilonwy falls into the hands of…
Taran the assistant Pig-Keeper has led heroic adventures and is a friend of princes, yet he is still troubled by his lowly status, and determined to discover the secret of his true identity.

He sets out to consult the powerful witches of Morva and the mysterious Mirror of Llunet. On…
The black sword Dyrnwyn, the most powerful weapon in the kingdom, has been stolen by the Death Lord Arawn. The greatest battle in the history of Prydain has begun.

Taran joins the war leaders as Prince Gwydion asks him to raise an army to march against Arawn's terrible warriors. Friends…