Miscellaneous papers containing notes, transcripts, extracts, copies of his own poems, etc., by Edward Williams ('Iolo Morganwg') bound together in one volume and paginated 1-390. The contents include notes on the perpetual calendar carved on wood known as 'The Staffordshire Clogg' (p. 13); notes on the special alphabet usually inscribed on wooden surfaces which, according to Edward Williams, was used by Welsh bards (pp. 15-25); notes on the method of inscribing the said bardic alphabet headed 'Llyma ddangos y modd y gwneir Coelbren y Beirdd' (p. 29; see John Williams: Barddas . . ., vol. I, pp. 142-51); notes, often in the form of questions and answers, on Welsh bardic lore relating to the origin of letters ('Pa fodd y cafad Gwybodaeth gyntaf ar lythyr' (p. 36), 'Pwy a wnaeth Lythyr gyntaf' (p. 41), 'Pwy gyntaf a gafas ddeall ar lythyr' (p. 91)), the origin of life ('O beth y Gwnaeth Duw'r byd a bywydolion' (pp. 77-8)), etc. (for much of this material see various sections of John Williams: Barddas, vol. I); notes on matters of bardic significance under headings such as 'Trioedd y Ford Gronn sef Trioedd Cadair Tir Iarll Er dangos a Gyrru addysg ar y Gwybodau a'r gelfyddyd a'r drefn a ddylid ar gadair a gorsedd ac ar Gerdd Dafawd . . .' (p. 72), 'Llyma Dderwyddoniaeth Beirdd Ynys Prydain a'i Barn am Dduw a phob bywydolion . . .' (pp. 85-9; see Barddas, vol. I, pp. 204-13), 'Llyma Rol Cof a Chyfrif' (pp. 212-14; see Iolo Manuscripts . . ., pp. 45-9, 424-9), and 'Teuluwr-Datgeiniad' (p. 244 ); notes on Welsh poetic metres, etc., headed 'Cerdd Deulu' (p.42), 'Llawrol y Beirdd Meyryg Dafydd' (pp. 51-2), 'Cylmau sef Caeau Cerdd Dafawd' (p. 180), and 'Pedwar Mesur ar hugain Dosparth Caerfyrddin' (p. 355); lists, many incomplete, of miscellaneous Welsh triads including lists with the headings 'Llyma Drioedd y Beirdd' (p. 78), 'Trioedd Ynys Prydain o Lyfr Iaco ab Dewi gan Rys Thomas' (pp. 157-63), 'Trioedd Cymmysg, 1798' (pp. 169-70), 'Trioedd o Lyfr Menw Hen' (p. 171), 'Trioedd Bonedd' (p. 172 ), 'Trioedd Addwynder' (pp. 173-5), 'Trioedd Gruffydd ab Cynan' (pp.183-? 90) 'Trioedd Dosparth y Ford Gronn' (p. 221), 'Trioedd amravaelion' (pp. 223-4), 'Trioedd Cerdd' (pp. 232-3, 267-8, 273), 'Trioedd Ach a Bonedd' (p. 234), 'Trioedd y Beirdd (Octr. 1797)' (pp. 241-2), 'Eraill o drioedd y Teuluwr' (pp. 245-6), 'Llyma drioedd Cerdd o Lyfr Celli Wion' (pp. 246-7), 'Llyma Hen drioedd Cyfarwyddyd . . .' (p. 249), 'Trioedd Cymmysg' (pp. 249- 50, 271-2), 'Trioedd Derwyddoniaeth' (p. 254), 'Trioedd y Beirdd' (pp. 258 + 252), 'Trioedd Barddas a Defodau' (pp. 260-62; see Barddas, vol. I, pp. 344-57), 'Trioedd Bonedd' (pp. 263-5, ? 262), 'Llyma Drioedd Llelo Llawdrwm . . .' (pp. 270-71), 'Llyma Drioedd o amrafaelion lyfrau . . .' ( pp. 273-4), and '. . . Rhai o drioedd ynys prydain a gymerwyd allan o lyfr Mr. Fychan yn Llyfrgell Hengwrt gan Lewis Morris, Esqr., 1738' (pp. 279-80 ); English translations of two of the aforementioned lists of triads under the headings 'The Bardic Triades' (pp. 251 + 253), and 'Druidic Triades' (p. 255); a copy of an 'awdl' attributed to Dafydd y Coed (p. 56); notes on Sir Gruffydd Llwyd, son of Rhys ap Gruffydd, and the late thirteenth century Welsh poet Trahaearn (p. 57); a copy of an epitaph attributed to Edw[ar]d Rich[ar]ds, Ystrad Meurig (p. 118); music and words under the heading 'Cyngog yr Iuddewonn' (p. 123); notes headed 'Collections for a Silurian Grammar' (pp. 129-30); notes ? on a proposal to publish a multi-volume work or works on matters of Welsh bardic, literary, linguistic, historical, and antiquarian interest (pp. 229-30, 236); notes on various forms of the proper name Einigan (pp. 238-9); a list of the names of ancient Welsh bards (p. 248); a version of the Welsh prose text 'Breuddwyd Gronwy Ddu' (pp. 275-6); a list of the traditional thirteen royal treasures of the Isle of Britain ('Llyma drithlws ar ddeg o frenin dlysau ynys prydain . . .') (p.276); draft proposals for publishing Cyfrinach Beirdd Ynys Prydain (p. 281); and a letter from [Edward Williams ] 'Iorwerth Morganwg' from Tredelerch, to John Edwards at Mr. Owen Jones, London, 1784 (personal, a ? proposed publication by 'Sieffrai o Walsal', Mr. [William] Warrington's proposed 'History of Wales', the writer's interest in the old realm of Glamorgan, changes in the names and boundaries of the medieval divisions of Wales, mention of [Owen Jones, 'Owain] Myfyr' and the Cymmrodorion and Gwyneddigion Societies, a request for a copy of 'awdl Aneurin ar amrafael rhannau Cymru') (pp. 343-6). The contents of pp. 289-342 and 347-82 consist almost entirely of transcripts of Welsh strict-metre poems in the form of 'cywyddau' and 'englynion'. Many of these bear one of the various bardic names adopted by Edward Williams at various times ('Iorwerth Morganwg', 'Iorwerth Gwilym neu brydydd bychan Morganwg', 'Iolo Morganwg') and all may possibly be his compositions.

A composite volume, pages 1-74 being in the hand of William Owen [-Pughe], pp- 75-90 in the hand of Evan Evans, 'Ieuan Fardd', and the title on p. 115 in the hand of Lewis Morris. The contents include: pp. 1-24, 'Golygiad ar farddoniaeth Lewis Glyn Cothi', being a catalogue of 223 poems [apparently based on the collection in B.M. Add. MS 14963], with some brief observations; pp. 29-31, a list of some parishes and divisions in Wales; p. 33, 'Awdl a gant Hywel ab Owain Gwynedd' beginning 'Dyn [sic] dewisy riein virein veindec . . .'; pp. 35-8, an incomplete index to the poems published in Owen Jones & William Owen, Barddoniaeth Dafydd ab Gwilym (Llundain, 1789), tt. 1-166; pp. 40-52, a list of the names of British saints; pp. 54-69, a further list of saints with their descent; pp. 71-4, a list of titles of the poems of [Dafydd ap Gwilym], most of which are crossed out; pp. 76-89, transcripts of 'Gwaith Argoed Llwyfein' by Taliesin, 'Arwyrein Owain Gwynedd' by Gwalchmai, and 'Marwnad Llywelyn fab Gruffudd' by Bleddyn Fardd, with parallel Latin translations; p. 90, a note by Evan Evans in Latin concerning Llywelyn ap Gruffydd and Madoc Min; pp. 91-114, four 'cywyddau' by 'Ieuan Fardd' ('Ieuan hirfardd', 'Ieuan ap Siencyn Ieuan'), [i.e. Evan Evans, 'Ieuan Brydydd Hir'), one dated 1752, and two by Gronwy [sic] Owen, one also dated 1752; pp. 115-17, 'Hyriad it Offeiriad o Dregaron, am ddywedyd nad oedd ym marwnad Ffredrig Tywysog Cymru nag Iaith na Chynganedd. 1752' by 'Ieuan Fardd', see infra, pp. 93-7.