This beautiful Missal made from parchment dates back to c. 1310 - c. 1320 and originates from East Anglia. It is considered a very important manuscript as it is one of the earliest examples of a Missal of an English source. This is also the first medieval musical manuscript to be placed on The National Library’s Digital Mirror.
http://www.llgc.org.uk/index.php?id=4487
http://www.llgc.org.uk/drychdigidol/she/SHE00001/index.html
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Because Aberystwyth is in Wales...