When young Catherine of Aragon, proud daughter of King Ferdinand and Queen Isabella, is sent to England to marry the weak Prince Arthur, she is unprepared for all that awaits her: early widowhood, the challenge of warfare with the invading Scots, and the ultimately futile attempt to provide the realm with a prince to secure the succession. She marries Arthur's energetic, athletic brother Henry, only to encounter fresh obstacles, chief among them Henry's infatuation with the alluring but wayward Anne Boleyn.