"I am Catalina, Princess of Spain, daughter of the two greatest monarchs the world has ever known...and I will be Queen of England."

Thus, bestselling author Philippa Gregory introduces one of her most unforgettable heroines: Katherine of Aragon. Daughter of Queen Isabella and King Ferdinand of Spain, Katherine has been fated her whole life to marry Prince Arthur of England. When they meet and are married, the match becomes as passionate as it is politically expedient. But tragically, Arthur falls ill and extracts from his young bride a deathbed promise to marry his brother Henry, become Queen, and fulfill their dreams and her destiny.

Widowed and alone in the avaricious world of the Tudor court, Katherine has to sidestep her father-in-law's desire for her and convince him, and an incredulous Europe, that her marriage to Arthur was never consummated, that there is no obstacle to marriage with Henry. For seven years, she endures the treachery of spies, the humiliation of poverty, and intense loneliness and despair while she waits for the inevitable moment when she will step into the role she has prepared for all her life.

In The Constant Princess, Philippa Gregory brings to life one of history's most inspiring women and creates one of the most compelling characters in historical fiction.