There are 2 books in the Damar series. The newest book is The Hero and the Crown which came out in 1984.

1
The Blue Sword

Book cover of The Blue Sword
Read this modern classic of young adult fantasy from award-winning, New York Times bestselling author Robin McKinley

Harry Crewe is an orphan girl who comes to live in Damar, the desert country shared by the Homelanders and the secretive, magical Free Hillfolk. When Corlath, the Hillfolk King, sees her for…
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2
The Hero and the Crown

Book cover of The Hero and the Crown
A Newbery Medal Winner

Although she is the daughter of Damar's king, Aerin has never been accepted as full royalty. Both in and out of the royal court, people whisper the story of her mother, the witchwoman, who was said to have enspelled the king into marrying her to get…