Three paper rolls, on rollers, containing four cywyddau by Iolo Morganwg, dated 1799-1810 (E10/1), Welsh poetry by Iolo, including over 100 englynion and forty-two dyrïau, dated 1778-1816 (E10/2) and Iolo's bardic alphabet, [c. 1817] (watermark 1815) (E10/3); together with another blank roll and an empty roller (E10/4-5). Also in the box is a bundle of papers containing a 'Survey for Mr Davies Pantysgallog', [1824] (E10/6); a few miscellaneous maps and drawings (E10/7); and three scraps of parchment, one containing a miniature painting of some goats (E10/8-10).

A transcript by William Jones ('Bleddyn'), Llangollen, of a collection of cywyddau, etc., made by David Jones ('Dafydd Siôn Siâms'), Penrhyndeudraeth. The authors are Robin Ddu, Dafydd Llwyd [ap Llywelyn ap Gruffudd], Llywelyn ab Owain ap Cyn[f]rig [Moel], Dafydd Gorlech, Edwart ap Rhys, Llywelyn ap Maredudd ab Ednyfed, Syr Thomas Chwith, Huw Pennant, Ieuan Brydydd Hir, Gruffudd ap Dafydd Fychan, Sion Ceri, Bedo Brwynllys, Deio ab Ieuan Du, Syr Dafydd Trefor, Gruffudd ap Tudur ap Hywel, Watcyn Clywedog, Owain Llwyd Physygwr, Maredudd ap Dafydd Fychan, Ieuan Leiaf, Ieuan ap Gruffudd ap Llywelyn Fychan, Rhys Llwyd ab Einion Fychan, Syr Dafydd Offeiriad, Gwilym ap Sefnyn, Harri Hywel, Sion Dafydd ap Gutun, Sion ap Hywel ap Llywelyn, Mathew Goch alias Owen, William Puw alias Pennant, John Rowland, Rowland Vaughan, Thomas Dafydd ap Siencyn, Richard Phylip, Ffowc Prys, Gruffudd ap Gronw Gethin ('o Lanfair Talhaiarn'), Owain ap Rhys ap Sion ap Hywel Coetmor, Morys ab Ieuan ab Einion, Syr Owain ap Gwilym, Sion Phylip, Edmwnd Prys, Rhys Wynn ap Cadwaladr, Tudur Penllyn, Tudur Aled and Dafydd Llywelyn ap Madog.

Miscellaneous notes broadly relating to Welsh and Glamorgan history, Welsh literature and related subjects. They comprise: bundles of loose papers (T3/1-2) and notebooks (T3/3-14) containing notes and memoranda on a variety of historical subjects, including Bonedd y Saint; notebooks and loose notes on Welsh poetry and poets (T3/15-18); miscellaneous notes on sayings, idioms, etc. (T3/19); a few recipes for ink and toothache (T3/20); miscellaneous fragments, together with three maps drawn on tissue paper (T3/21); a bundle of annotated wrappers used by Taliesin to sort some of his and his father's papers (T3/22 – see also T13/7); six booklets, 1838-1839, containing extracts from manuscripts relating to Wales at the British Museum and Bodleian Library (T3/23); a bundle of foolscap sheets containing mostly genealogical texts relating to Welsh saints and legendary figures (T3/24); and a transcript of a lecture on Oriental languages 'Delivered by Professor [Duncan] Forbes at K[ing's] C[ollege] London', November 1837 (T3/25).

A volume in the hand of William Maurice of Cefn-y-braich, Llansilin, Denbighshire. The name 'Guil. Mauriciu[m]' appears on f. 4 verso and 'Guil. Mauricij' on f. 5. The entry on f. 4 verso, which reads '[ ] Brit. Gram[m]atica, ex Autographo [memb]ranaceo fidelitur transcript per Guil. Mauriciu[m] Lansilinensem tunc Studij Antiq. Tironem. Ano. D[omi]ni 1639. Aet: 19.', not only gives Maurice's age and an idea of his year of birth, which was not previously known, but also links the manuscript with item number 38 in a list of manuscripts at Wynnstay in Angharad Llwyd's 'Catalogue of Welsh manuscripts, etc. in North Wales', Transactions of the Cymmrodorion... 2.1 (1828), 36-58 (p. 53). A note added on f. 20 verso reads 'Y nawed dydd ar higain /o/fis Ionawr pann oedd oed Crist mil a chwechant a phedwar ar ddeg a rhigain y llosgodd dâs eithin Curn Foelfre gann dân or awyr' and also links the manuscript to the Llansilin area, the hill Gyrn Foelfre being just over a mile from Cefn-y-braich. The ink throughout is heavy dark brown ink, which is so characteristic of William Maurice's transcriptions. This is interspersed with red ink, especially when citing literary quotations as examples (ff. 31 verso-51, 53-57). A note in the hand of William Maurice (f. 57), incomplete because of fire damage, suggests that the manuscript was copied from a manuscript borrowed from '[ ] Siôn'. This may well be a reference to Richard ap Siôn of Sgorlegan, Llangynhafal (fl. 1578-1611), who is known to have transcribed copies of the bardic grammars [Peniarth MSS 159-160]. The original text probably measured 140 x 190 mm.; the text was arranged in two columns, each 90 mm. wide; most of the right hand column (recto) and left hand column (verso) has been lost as a result of the fire.
The manuscript contains the following: 'Llyma ddosbarth Edyrn dafod avr' (ff. 5-10 verso); 'Llyma ddechrav dosbarth y pvmp llyfr cerddwriaeth cerdd dafawd' (ff. 11-20 verso); 'pa sawl rhan y sydd o ymadrodd' (ff. 21-40 verso); 'Bellach yr ysbyswn am y pedwar messvr ar vgain cerdd dafawd' (ff. 41-54 verso); 'Bellach yr ysbyswnn am ba fodd a pha ddelw y dyleir moli pob gradd' (ff. 55-59); two verses of poetry, one of which is attributed to Huw ab Robert (f. 59 verso). A discussion of the texts contained in the manuscript is contained in the volume Gramadegau'r Penceirddiaid, ed. by G. J. Williams & E. J. Jones (Caerdydd, 1934)

Miscellaneous papers and booklets containing prose and verse items in the hand of Edward Williams ('Iolo Morganwg') bound into one volume. Verse items, pagination in brackets, include transcripts of strict- and free-metre Welsh poems, sometimes a single stanza or 'englyn', or extracts from Welsh poems attributed to Llywarch Brydydd y Moch (6), D. Edmund (18, 430), Howel ap Syr Mathew (20), Thomas Llywelyn 'o Regoes' (? 21-4, 226 with a note relating to the poet's son), Dicc Hughes (24, 119-26 ), D. Lld. Math[afar]n (24), Syr Lewys ab Huw 'o Fochnant' (25-30), Thomas Evans (31-7), ?Huw Dafydd (37-44), Llywelyn ap Hywel ap Ieuan ap Gronwy ( 56-7), Bedyn Wilco (65-6), Huw Dafydd (68-71), Thomas ap Gwilym 'o Ferthyr Tudfyl' (73-5), Wiliam Sawndwr (83-4, 103-05; see IM, t. 302), Siôn Lewys Hywel 'o Lantrisaint Meisgin' (93-4), Thomas ab Ifan 'o Dre Brynn' (94-6), Llywelyn Deio Pywel (96-8), ? Siencyn Lygad Rhawlin (100-03), Twm ab Han ab Rhys (105-08), R. Hughes (126-32), Llywelyn ab Hwlkyn 'o Fôn' (133-6), ? Watcin Dafydd 'o Ben y Bont' (175 + two unnumbered pages following), Gronw Gethin ab Ieuan ab Lleison 'o Faglan' (185-6), Dafydd Nanmor (186), Dafydd Thomas 'o Dregroes' (187-8), Rhys ap Ioccyn 'o Dre-golwyn' (189-91 with an added note thereon by 'Iolo Morganwg'), Siôn Morgan 'argraffydd o'r Bont Faen' (213-14), Siôn Wiliam 'o Landathan' (214-16), Efan o Lan y Lai (227), Iorwerth ap Sierlyn (231), Gwilym Tew 'o Lynn Taf' (232), Emion Offeiriad (263-4), Daf. ab Gwilym (273, 277-8), y Parchedig Dafydd Dafis 'o Gastell Hywel' and 'o Lwynrhydowen' (274-6), Rhys Meigen (277), William Walters (297-304), Dr. T. Wms. (314), Taliesin (316), Siôn Philip (316), Edmund Prys (316, 383-91), Ed. Richard (316), Huw Caerog (323, 392), Huw Llyn (323, 392 ), Huw Pennant (323, 393) William Cynwal (323, 393), Huw Ednyfed (324), Gruff. ab Lln. Fychan and Ifan Brydydd Hir jointly (324), Lewis Môn (324), D. Edmund (331), Merddin Emrys (336), Syr Wiliam Herbart (340), Hywel Dafydd ap Ieuan ap Rhys (340), Owen Brereton (341), Tudur Aled (383), Wm. Byrkinshaw (392), Ieuan Tew (392), R. Dafies, Escob Mynyw (393), Siôn Tudur (393), [Edward Williams] 'Iolo Morganwg' (423-?25), Wm. Llyn (430), Robt. Clidro (430), Howel Bangor (430), and Madawg ab Merfyn Gwawdrydd (431-2); transcripts of unattributed Welsh verse (17-20, ? 37-40, 45-56, 57- 64, 66-7, 98-100, 136-43, 145-50, 202, 227-9, 258, 316, 317-21, 327, 331, 334, 449-54, 461); and also transcripts of English verse (72, 330). Prose items, pagination in brackets, include a brief paginated list of events recorded in W. Wynne: The History of Wales (1-2); genealogical data relating to the descendants of Brychan Brycheiniog based upon the data in the appendices to Theo[philus] Jones [: A History of the County of Brecknock, vol. I, 1805] (3-6); notes relating to the Welsh medical treatise 'Meddygon Myddfai' (8-10); an extract from [The] Myvyrian Archaiology [of Wales], vol. II (11); a note relating to a manuscript allegedly once in the possession of Dafydd Rhisiart 'o Landocheu'r Bont Faen', which had contained, inter alia, some twenty poems by Wil. Hopcin (85); a brief comment on the Welsh language (92); a note relating to Owain Glyn Dwr's activities in Glamorgan allegedly extracted from a manuscript history in the possession of the Rev. Thos. Bassett of Lanelay (151-2); a brief note on Cae Llwyd in the parish of Llangyfelach [co. Glamorgan], home of the poet Huw Cae Llwyd, and on Ieuan ap y Diwlith (155); a note relating to the antiquity of the Cymmry (Kimmeri) as a nation and of the word itself as a national appellative (157); brief data re the descent of King Arthur (158); a list of slanderous epithets for the use of which Margaret John Harri had been excommunicated at Llandaff Consistory Court in 1816 (159); a list of ministers of religion who had attended an annual meeting [? of Unitarians] at y Gelli onnen [co. Glamorgan] in 1813 (161); a copy of a fable re a king and three wise men (177-80); an anecdote relating to the origin of the fruit trees at Margam [co. Glamorgan] (181); 'sayings' attributed to Taliesin ('Gwiredd Taliesin') (182); an anecdote relating to Taliesin and Cattwg Ddoeth (182-3); notes on Welsh poets, 14th- 17th cent. (193-201); a list of five subject headings under the superscription 'Bards, Topics for History of' (202); medicinal recipes ? from 'Meddygon Myddfai' (203); a short list of Glamorgan proverbs (208); a copy of the proclamation of an 'eisteddfod' to be held at Caerwys, co. Flint, to July 1523, extracted from Siôn Rhydderch [: Grammadeg Cymraeg, 1728] (219-20); a list of 'sayings' attributed to Saffin (220-23); a copy of a parable relating to a blind man's search for riches (224-6); a note on Cwrt Aberavan in the parish of Margam [co. Glamorgan] and a list of 'Parselon Margam' (230); a note on the poet Rhydderch ap Ieuan Llwyd (231); (continued)

A list of the early kings of Britain and of the Britons back to the time of Brutys and Eneas Ysgwyddwyn (233-6); a copy of a parable relating to a rich man and a hermit (236-9); brief notes relating to certain physical features in the parish of Merthyr Tudfyl, co. Glamorgan, and to Hywel Rhys, the bard, and his descendants, and references to Blaen Cannaid, Llwyn Celyn, and Cwm y Glo and other Nonconformist meeting houses [in co. Glamorgan] (239 + 242); a copy of a memorial inscription to Morgan Herbert of Havod Uchtryd, co. Cardigan, ob. 1687/8, in Eglwys Newydd Church near Havod, and of an inscription relating to the history of the church (240-42; see S. R. Meyrick: The History and Antiquities of the County of Cardigan, London, 1810, pp. 347-51); brief notes on the dates of the conversion of 'Daenmarc', 'Llychlyn', 'Gwyddelod y Werddon', 'Gwyddelod yr Alban', and 'Gwyddelod Môn ag Arfon' to the Christian faith (257); a brief note relating to markets at Castell y Coetty and Pen y Bont ar Ogwr ? temp. Henry VIII and previously (258); brief notes relating to Sir Edward Stradlin [n.d.] and Thomas Stradlin, temp. Henry VIII (259); notes relating to Welsh strict metres, Elisse ap Gwalchmai 'o Ial', and Dafydd ap Gwilym (264-5); genealogical data headed 'Achau Morganiaid Tredegyr' ( 266-7); medicinal recipes, some from 'Meddygon Myddfai' (268-70, 287-91); brief miscellanea extracted from Panton MS 30 [now NLW MS 1999 (313- 14); an account of the return of Brân ap Llyr from captivity in Rome accompanied by the saints Ilid, Cyndaf, and Meugant Hen (329); comments on the authenticity of Welsh manuscripts ? containing medical material with mention of three such manuscripts, and twelve points ? relating to a pre- sixteenth century manuscript of this nature ? in Jesus College, Oxford (332-3); a list of eight 'sayings' attributed to Cattwg ddoeth (333); notes on the 'three primary or fundamental attributes of God' (335); a brief geographical / geological note relating to the Llangyfelach area [co. Glamorgan] (335); an anecdote relating to Llywelyn Bren and Sir Wiliam Flemin (360; an explanatory comment on Henry Salisbury's wrong definition of the word 'cler' (361); notes relating to the use of the 'Silurian dialect' in Welsh prose and verse of the Middle Ages in North and South Wales and comments on 'anglicisms, English construction, and English idioms' in the Welsh translation of the Bible (363-5); a list of family names to illustrate a Glamorgan custom of 'prefixing the Article to the surnames of the Gentry' (366); a list of places in Glamorgan with, in some instances, specific natural features, antiquities, etc., associated therewith, short lists of locations of inscriptions, caves, and cromlechs [in co. Glamorgan], etc. (367-9); a list headed 'Subscribers - 1804' containing seven names but naming no publication (370; a list of the names of thirty-four Welsh poets, 13th-16th cent., literary historical manuscript volumes or works such as 'Llyfr Coch Hergest', 'Brut y Brenhinoedd', etc. (373-4); a note relating to the convention of poetic contentions (391); an anecdote relating to Gutto'r Glynn at an 'eisteddfod' held in Cardiff Castle under the patronage of Sir Wiliam Herbert (394, for the ending see p. 340); a list of 'sayings' attributed to Cattwn Ddoeth all commencing with the word 'Tryw' (401); a list of nineteen items relating to Welsh bardism, music, grammar, etc., headed 'Jones Gelli Lyfdy MS. No. 120' being presumably an incomplete list of the contents of one of the manuscripts of John Jones of Gelli Lyfdy [co. Flint; ob. ? 1658] (407- 09); poetic extracts to illustrate the meaning of specific Welsh words (415-16, 418, 457-9); a note relating to dialects in Wales (427); a list of ten points or topics under the heading 'Plan of a Religious Society' (442); a list of 'Casbethau (or Casddynion) Selyf Ddoeth' (447); brief notes relating to Welsh bardism from the time of Gwrtheyrn Gwrtheneu to the time of the 'eisteddfod' at Caerfyrdd[in] convened by Sir Gruff. Nicolas (477-8); notes relating to Welsh metres and versification (479-87 ); notes on the connection between Cynddelw, Einion Offeiriad, Tryhaearn Brydydd Mawr, Gwilym Tew, Owain ab Rhydderch, Dafydd Llwyd Mathew, Dafydd Ddu o Hir Addug, and Dafydd ab Gwilym and certain Welsh poetic metres, a list of metres as arranged by Dafydd Llwyd Matthew, and another such list from 'hen Lyfr arall' (488-92); incomplete notes containing references to bardic topics such as 'sefydliad Dosparth Caerfyrddin', 'Eisteddfod Gyntaf Caerwys, 1525', 'Ystatut Gruffudd ap Cynan', 'Dosparth y Ford Gron', and 'Dosparth Tir Iarll' (503-04); miscellaneous genealogical data (249-51, 268, 315); miscellaneous Welsh triads (155, 217-19, 244-5, 247, 271-2, 359, 402, 445-6, 448, 466); and lists or groups of Welsh words, with, in some instances, definitions, illustrative examples, etc., or notes on Welsh words (7, 12, 243, 315, 336, 341, 359-62, 399-406, 411, 427, 429, 441-2). In one instance notes have been written across the face of a printed leaflet announcing the printing by subscription of Edward Williams's two volumes of English verse Poems Lyric and Pastoral (7 + 10).

'Geirlyfr William Lleyn'; 'Bardhoniaeth ... William Middelton'; pedigrees and arms, mainly of North Wales families; 'cywyddau', 'awdlau', etc. by Adda Fras, Iolo Goch, Maredudd ap Rhys, Robin Ddu, Rhys Nanmor, Gwilym ab Ieuan Hen, Dafydd Gorlech, Tudur Aled, Gruffudd ab Ieuan ab Llywelyn Fychan, Wiliam Llŷn, Sion Cent, Sion Tudur, Thomas Prys, Lewis Menai, Gruffudd Phylip, Richard Cynwal, Edmwnd Prys, Wmffre Dafydd ab Ifan, Wiliam Phylip, Sion Bryncir, Siôn Phylip, Richard Phylip, Sion Dafydd Lâs [John Davies], Watcyn Clywedog, Mor[u]s Dwyfech [Morus ap Dafydd ab Ifan ab Einion], Huw Lewis, Dafydd ap Hwlcyn ap Madog, Rhisiart Brych, Dafydd Jones ('Ficer Llanfair-Dyffryn-Clwyd'), Owen Gruffydd, Sion Lleyn [John Roberts], Taliesin, Rhys Goch Eryri, Dafydd Llwyd ap Llywelyn ap Gruffudd, Sion Roger, Sypyn Cyfeiliog [Dafydd Bach ap Madog Wladaidd], Bedo Brwynllys, Mathew Owen, Edward Morus, Huw Mor[y]s, Ieuan Dew Brydydd, Huw ab Ifan, Robert Davies (Nantglyn), Robin ab Iorwerth, Rolant Huw (Graienyn), Dewi Wyn [o Eifion] [David Owen], Griffith William (Braichtalog), Goronwy Owen, John Thomas (Pentrefeidiog) [i.e. Pentrefoelas], M[organ] D[avies], Griffith Puw, Dafydd Jones ('Tailiwr'), William ab Edward ('o'r Bennar'), Thomas Edwards ['Twm o'r Nant'], Lewis Morris, Ieuan Llwyd [Brydydd], Rhys Llwyd [Pant-y-piod], Rolant [Rowland] Jones (Pandy) [Roli Penllyn], Hugh Jones (Llangwm), John Jones [Jac] (Glan y Gors) and W[illiam] Jones [Bardd Môn]; 'englynion' by several authors; material relating to persons and places in Merioneth.