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Twenty-eight notebooks and bundles, 1796-1815, consisting of travel journals and agricultural notes relating mainly to Iolo Morganwg's work for the Board of Agriculture in Glamorgan and Carmarthenshire in 1796 and his contribution to Gwallter Mechain's General View of the Agriculture and Domestic Economy of South Wales (London, 1815).
Also included are fragments of tours in parts of England (E5/13); a journal of his tour to North Wales in 1799, collecting materials for the Myvyrian Archaiology (E5/18, formerly 'IAW 144'); bundles of loose agricultural notes (E5/26-27); and geological notes relating to Glamorgan (E5/28).

Miscellaneous pedigrees and other biographical material relating mostly to Wales, with some items relating to Gilbert Wakefield.

A collection of South Wales pedigrees compiled between 1578 and 1588. It also contains a copy (mutilated) of a poem by Siôn Cent beginning 'Pannyd Ryfedd wirionedd ar inion olwc' and a list (also mutilated) of the names of the sheriffs of Breconshire. Their year of office is not given, but there are 92 names in all, the last three being Thomas Bulcott, Thomas Gwyn, and John Stedman: the list differs slightly from that printed in Theophilus Jones's History of Brecknockshire. Iolo Morganwg has annotated the volume and has frequently written 'Dal sylw!' or similar phrases in the margins. He has also picked out various names which occur in the pedigrees, among them 'Meredydd ap Rhys ap Rhiccert' (p. 41) and 'Rhys goch ap Rhiccert' (p. [1]15), although in the second instance the name in the pedigree is 'wenllian verch Rys goch ap Rys voel ap Rikert ap einion ap gollwyn'.

Papers relating to Iolo Morganwg's imprisonment in Cardiff Gaol for debt (98/1-25) and to the parish of Rumney and Manor of Rompney, Monmouthshire, where he briefly farmed land given him by his father-in-law (99/1-54).

Letters (surname Williams) addressed mostly to Taliesin Williams (Taliesin ab Iolo).
The correspondents include Thomas Williams (Gwilym Morganwg), 1825-1834 (Nos 877-885), and William Williams, Aberpergwm, 1835-1843 (Nos 888-1000).