Paleography

Palaeography (UK) or paleography (US; ultimately from Greek: παλαιός, palaiós, "old", and γράφειν, graphein, "to write") is the study of ancient and historical handwriting (that is to say, of the forms and processes of writing, not the textual content of documents). Included in the discipline is the practice of deciphering, reading, and dating historical manuscripts, and the cultural context of writing, including the methods with which writing and books were produced, and the history of scriptoria.
More information on the Wikipedia page .
An online tutorial on paleography set up by The National Archives (UK) here. There are a variety of online and printed sources and courses.
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