Michel Roger Lafosse is from Belgium - an ordinary man, like most of the rest of us. Unlike most of the rest of us, he has embarked on a fantasy in which he is a prince. This may sound like the start of a children's fairytale story, but it happens to be the best way to begin the real life story of the author of this book. It also puts this book, which he claims is about his ancestors, in context.
Of course, the author Michel Lafosse (who now styles himself HRH Prince Michael of Albany, etc. etc.) was challenged to produce some evidence of his noble claims. He produced a birth certificate, which was dismissed as a forgery by the very authorities in Belgium that he claimed had issued it. His own real birth certificate, of the same date, shows his parents' names, less any mention of the titles that were added in the forgery. Yes, gone is the "Baron" in front of his father's name, and gone is the "Princess" in front of his mother's. Indeed his father's occupation is listed by the registrar as that of shopkeeper, while his mother is listed as a business employee. Through invention of ancestors and twisting of historical detail, Michel Lafosse has managed to write himself into his own imaginary version of history - and you can read it all in this book. I wonder if we need to consider the validity of the book contents at all after these simple facts.
There are many, many other areas where he has been caught out - producing poor quality forgeries of Vatican documents, the apparent use of the same typesetting machine on documents supposedly hundreds of years apart (and produced by both Catholic and Protestant churches), and so on - but the space is too limited to properly counter his arguments here. Oh yes, he does claim he is directly descended from Jesus too.
Should you buy this book? If you are looking for knowledge and history, NO. It is written as one man's self-serving account of history with the intention of making him look like he is someone that he is clearly not. However, if you are looking to be entertained by a delusional man, then YES.
But for your own sake, do not leave it lying around the house where your school-going children might pick it up. You do not want them failing history exams or being laughed out of college. I suggest putting some highly visible stickers with the words "Fiction" or "Fantasy" on it, just in case.