- NLW MSS 21387-433.
- Is-fonds
- [c. 1590]-1900
Rhan oIolo Morganwg and Taliesin ab Iolo manuscripts and papers
Miscellaneous papers created or collected by Iolo Morganwg, including poetry and prose in Welsh and English; autobiographical and biographical material; vocabularies; papers relating to work as a monumental mason, stonemason and builder; broadsides and other political material; Unitarian and theological papers; pedigrees; topographical notes; and advertisements.