The records of the Irish chancery were destroyed on 30 June 1922 in an explosion and fire in the Public Record Office of Ireland, located at the Four Courts, Dublin. Among the most important classes of record destroyed were the medieval Irish chancery rolls.
The site contains over 20,000 Irish chancery letters translated from Latin into English, together with an unparalleled collection of digital images of surviving medieval chancery letters and rare printed volumes.
Find out more here http://chancery.tcd.ie/content/aims-and-scope
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