Diplomatics

Diplomatics is the science that studies the form, structure, and genesis of documents, above all the solemn legal instruments of the Middle Ages such as charters, diplomas, and acts. Founded as a discipline by the Benedictine scholar Jean Mabillon, whose De re diplomatica (1681) answered Jesuit doubts about the authenticity of Merovingian charters, it provides a rigorous procedure for deciding whether a document is genuine and for dating and localizing it. The method rests on the observation that documents produced by a given chancery follow highly regular conventions: a fixed sequence of parts, recurring verbal formulae, standard modes of validation by seal and subscription. By dissecting a document into its constituent elements and comparing each against attested norms, the diplomatist detects forgeries, interpolations, and anachronisms, and pins a document to a place and time. Diplomatics is thus the most formalized branch of external source criticism.