Phillipa Gregory specializes in historical fiction focused on the Tudor dynasty, although it might be more accurate to describe her books as "history lite". Her books are clearly well researched and quite detailed, but you wouldn't want them to be your sole resource if you're discussing actual historical events. "The Constant Princess" is a welcome addition to her works on the Tudors, with Katherine of Aragon as its heroine. "The Constant Princess" traces Katherine's development from youngest, favorite child of Isabella and Ferdinand of Spain, through her young marriage to Prince Arthur of England, years of solitary widowhood, until she finally reaches what she views as her ultimate destiny, the throne of England as wife and queen to King Henry VIII. The book is told mainly from Katherine's perspective, and gives a particular slant on her motivations in sticking with her fight to be queen, despite the odds against her. "The Constant Princess", as with Phillipa Gregory's other books, paints a fascinating portrait of life at court, but should be taken with a grain of salt as far as historical accuracy is concerned. Overall, a worthwhile, engaging, and informative read.