From records [0]. Interestingly the book had some blank pages filled with extra prayers by someone later. You can't conceivably carbon date a scratch. But the

From records [0]. Interestingly the book had some blank pages filled with extra prayers by someone later. You can't conceivably carbon date a scratch. But the book could easily be carbon dated but that process has its own difficulty [1] and relates only to the time the animal or other organic matter the book is made of. [0] https://medieval.bodleian.ox.ac.uk/catalog/manuscript_8904 https://medieval.bodleian.ox.ac.uk/catalog/manuscript_8904 [1] https://www.nature.com/articles/d41586-020-01499-y https://www.nature.com/articles/d41586-020-01499-y