It is written in 14th century English which is extremely interesting. The writer is fluent however he does take his time to get to the point. Saying that the book is mesmerizing . Its a book to enjoy. I have not read all so am not qualified to comment on whether the written material can be used for research. I feel as if I have found a treasure of a book. I will let you know if I still feel the same after I have read the complete book.. if you decide to read it I hope you also enjoy the book as I am at the moment