In The High King (winner of the Newbery Medal), Rhun is now the King of Mona, as his father has died in the unspecified length of time which has passed since the end of The Castle of Llyr.
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In The Castle of Llyr, Prince Rhun sets out on a journey with Taran the Assistant Pig-Keeper, Fflewddur Fflam the Bard, and the creature Gurgi on a quest to protect the Princess Eilonwy from an unknown danger.
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