The Lady of the Rivers by Phillipa Gregory (fiction)

Gregory contributes consistently good historical fiction, especially about women.  Only seldom does she repeat simple characterizations too much, but this book about Jacquetta, Elizabeth Woodville's mother, suffers a little more than usual because so little is known about her.  The beginning of the book, about Jacquetta's childhood, is most enjoyable, perhaps because the author feels free to invent a beautiful and compelling story, as there is nothing in the "facts" to hold her back.