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You make two very good points. I think I will change the first sentence to ""The binding of red leather with gilt tooling is post-medieval."" until we have a more specific date.  I see your point on the word prefatory. Can you suggest a better term to cover the all of non-biblical texts and tables that were included with with early Gospel Books (Jerome's letters, the canon tables, name lists, the various prologues and arguments, etc.) Perhaps ""explanatory"" might work. I do think that the fact that the prologues are gathered together in the beginning should be mentioned since in many of the other insular manuscripts they are not.  "