Drafts and notes in the hand of Taliesin Williams for the volume Iolo Manuscripts, A Selection of Ancient Welsh Manuscripts, in prose and verse, from the collection made by the late Edward Williams, Iolo Morganwg,… with English translations and notes by his son, the late Taliesin Williams (Ab Iolo) of Merthyr Tydfil (Liverpool: Welsh MSS Society, 1848).
Included are manuscript drafts of the Welsh texts on pp. 3-328 passim (T4/1), drafts of the English translations on pp. 341-496 passim (T4/2), drafts for the footnotes on pp. 332-489 passim (T4/3), a draft of pp. 331-507 passim combining text and footnotes (T4/4), and notebooks containing notes and memoranda relating to the volume (T4/5-11). Also included is a bundle of draft texts, relating mostly to Welsh saints in a format similar to T4/1 but which were either omitted from the volume or intended for another book on Bonedd y Saint (T4/12).