The Lady of The Rivers
by Philippa Gregory
Publisher: Simon & Schuster UK ltd
Publication Date: 2011
Summary (via Goodreads)
Jacquetta, daughter of the Count of Luxembourg and kinswoman to half the royalty of Europe, was married to the great Englishman John, Duke of Bedford, uncle to Henry VI. Widowed at the age of 19, she took the extraordinary risk of marrying a gentleman of her household for love, and then carved out a new life for herself.
Sooo....If you have read the first two books so far you already will know that Elizabeth Woodville aka The White Queen married for love. And she isn't the only member of her family who did this. Jacquetta, her mother, also married against custom to a man from lower birth than herself in an era when marriages were for extending the families prospects, not for true love.