One of the most overlooked families of the early modern period, the Courtenays played a critical role, and their story of love and loss, loyalty and betrayal, survival and ruin is played out at the courts of four Tudor monarchs. Katharine, Countess of Devon, was Edward IV's daughter. Her first proposed marriage would have made her Queen of Spain, but she was declared a bastard on the accession of her uncle Richard III. Legitimated under Henry VII, she eventually married Sir William Courtenay, heir to the earldom of Devon. Her closeness to her sister, Queen Elizabeth of York, did not...