Ok, so I read the first book, The Greatest Knight, also by Elizabeth Chadwick, and what I like about this book is that it takes what we know of in history and spins a tale that incorporates the fact with fiction written to suit the prose- but none of it comes off as hokey or contrived. In fact, the book reads as well as any in the genre- Chadwick's grasp of all things medieval is what sets this book apart from some others; it is obvious she's done her research and her treatise on the Marshal does him justice, IMHO.
Definitely worth reading, both books- since we are of The Order of the Marshal, why not?