Despite their territorial designations and the fact that they were in the Peerage of Ireland, the titles all referred to the place in Glamorgan now spelt Llandaff.
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In Llandaff Cathedral, nearby Radyr, there exist three 15th century and 16th century Mathew family effigies.
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It was created in 1797 for Francis Mathew, 1st Viscount Landaff, who had previously represented County Tipperary in the Irish House of Commons.
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