There are 3 books in the Alix of Wanthwaite series. The newest book is The Prince of Poison which came out in 2006.

1
The Shield of Three Lions

Book cover of The Shield of Three Lions
The first novel in the Alix of Wanthwaite series, by bestselling author Pamela Kaufman.

Eleven-year-old Alix is the daughter of the baron of Wanthwaite, whose lands along the Scottish border are among the best in England. But when her family is killed and her lands seized, Alix is forced to…
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2
Banners of Gold

Banners of Gold
The enchanting Alix of Wanthwaite returns in a suspenseful and richly textured adventure in which nothing less than the future of England is at stake.

Alix is home at her beloved estate on the Scottish border when King Richard’s soldiers march into her castle and demand to take her to…

3
The Prince of Poison

Book cover of The Prince of Poison
For decades, Pamela Kaufman has entertained a loyal readership with the mesmerizing and often hilarious adventures of Alix of Wanthwaite, madcap medieval beauty. Now, in the trilogy's long-awaited conclusion, The Prince of Poison finds Alix homeward bound at last, with a half-royal child in tow and an angry monarch on…