You can search the following databases from The National Library website.
Index to the Gaol Files of the Court of Great Sessions in Wales, 1730-1830
Index of applicants for marriage licences 1616-1837
Finding-aids containing detailed descriptions of the archives housed at The National Library of Wales (incomplete, but growing)
Archives and Manuscripts received before 1999
Archives and Manuscripts received after 1999
A guide to the manors and manorial records of Wales searchable through the National Archives website.
Brief descriptions of the Library's archival holdings
The following databases are only available to registered users at The National Library of Wales building in Aberystwyth.
A guide to the location of Nonconformist records
A new index to the pre-1858 wills and administrations proved in Wales.
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