Papers of Lady Charlotte Guest (née Bertie), 1827-1851, [?1873], comprising manuscripts of parts of her English translation of the Mabinogion and their accompanying notes, 1838-[1843]; other manuscripts directly related to her work on the Mabinogion, [?late 1830s]-1851; early notes compiled by Charlotte Bertie (later Guest), on a variety of subjects, 1827-[1830s]; and other miscellaneous items including a deed box.

An Oxford DPhil thesis by Ceridwen Lloyd-Morgan, 1978, entitled 'A Study of Y Seint Greal in relation to a Queste del Saint Graal and Perlesvaus', studying the provenance of the Middle Welsh prose romance and its relation to its Old French sources.