A composite manuscript lettered 'BARDDONIAETH &c.' on the spine. The volume, which contains 'englynion', 'carolau' and pedigrees, is written for the most part (ff. 1-52 verso and 75 verso-101 verso) by Wiliam Dafydd Llywelyn of Llangynidr (c. 1520-1606) (cf. NLW MS 15542B). Another hand is responsible for ff. 53- 75, but Wiliam Dafydd Llywelyn appears to have annotated this middle section. Folio 6 verso carries an eighteenth century list of payments, and folio 7 verso is blank. The contents are: ff. 1-2 verso, part of the story of 'Trystan ac Esyllt' (cf. 'englynion' 9 to 28 in Ifor Williams, 'Trystan ac Esyllt', The Bulletin of the Board of Celtic Studies V, pp. 118-21); ff- 3-5v, a religious carol beginning 'hanpych well y gaua[. . .] . . .', with each stanza ending 'ora tu pro nobys'; f. 6 recto-verso, 'englynion': one by Huw Arwestl beginning 'medru tewi weithie yes medria[d] [sic] gydwedd . . .', as well as three written in praise of the song-thrush by Dauydd llwyd Mathe, 1581, Dafudd Benwyn, and Wm Mydleton; f. 8 recto-verso, a short extract of religious prose beginning 'Jessv grist yn keidwad y godoedd o feirw y fyw . . .'; f. 8 verso, an 'englyn' 'pen ddarffo rifo y ryfic, ymgais . . .'; ff. 9-46, 'Dyma englyn[ion ] . . .', a series of 226 'englynion' based on proverbs and epigrams, the first beginning '[D]auparth gwaith ganwaith rag wynebdychryn . . .', 'per Tho[mas] ap Hughe de Ewyas', the epigram or proverb is rubricated oftener than not; ff. 46 verso-48, '[ ] englynion y datts', beginning 'dau .cc. a v. mil digwyn / ont dayfis . . .'; f. 48 recto-verso, five 'englynion' beginning 'Un sir ar bymtheg medd sain / lliwgalch . . .'; ff. 49-51, a series of nineteen 'englynion' recording the accession dates of the kings and queens of England between Henry II and Elizabeth I, beginning 'pymp deg pedwar teg myn tain / ywch ka[nt] . . .'; ff. 51 verso-52, eight stanzas beginning 'hawdd o beth y[w] nabod cwilsen . . .'; f. 52, two 'englynion' beginning 'mi a gaf y geisaf fal negeswr / dof . . .'; f. 52, a 'hir a thoddaid' beginning 'Rag Kythrel anfwin . . .'; f. 53, the six last lines of a carol ending 'am y fordd [sic] y gorfydd myned'; ff- 53-73, a long carol based on biblical and historical events, entitled 'Iacob 4 Glanhewch ych dwylaw bechadurieit a phurwch ych calonaw [sic] dauddyblug feddwl', beginning ' fal iroeddwn i n effrv . . .'; f. 73 verso, five stanzas beginning 'Dues wyn diwad . . .', with the following note accompanying the text 'ymofynnrvch am ddiwedd hyn yma yn well o rhyw goppi arall oscat vidd nid oedd ef yn cesio oddli ne ni fedrei Amendiwch y dywaetha fal hyn i odli os mwnwch'; f. 74 recto-verso, lines in the 'cywydd' metre beginning 'Rhown moliant gan tant bob didd . . .'; f. 74 verso, an 'englyn' based on Mat. [xxiv, 35.], beginning 'Nef a daear wfir o wall / a dderfydd . . .'; f. 75, an 'englyn' by Simwnt Vychan beginning 'Pumptheccant gwyddant y gost / a decwyth . . .'; f 75, two 'englynion' by Da[vid] Johns beginning 'Mil a hanner noder yn wiwdec cynnwys . . .'; f. 75 verso, three 'englynion' beginning 'pwy ywr mares garw a gyrydd myrain . . .'; ff. 76-80, a description of arms of Welsh nobles entitled 'Dysgrifiad arfey y bryttan[ied] o vryttys hyd heddiw'; ff. 80 verso- 82, 'Disgliriad [sic] pob gwlad yn neilltyedic o waith Einion ap gwawdrydd mewn englynion', beginning 'Gnawd yngwynedd fokyssedd eirey . . .', [ usually attributed to Aneurin Gwawdrydd]; f. 82 recto-verso, seven 'englynion' of a prophetic nature beginning 'pan welych yr ych mawr ychod / antyrys . . .'; f. 83, a short English prophecy beginning 'Take hyd of Seuen . . .'; f. 83, a list of characteristics attributed to twelve areas of Wales and the Marches in which they surpass others, beginning 'Pen Bonedd Gwynedd'; and ff. 83 verso-101 verso, a list of pedigrees of noble Welsh families entitled 'llyma Betigriw y bryttanied' beginning 'llywelyn ab Gryffydd ap ll ap lorwerth drwyndwn ap Owain gwynedd . . .', continuing f. 84 'llyma Iach bryttys', f. 85 'Rodri Mawr ap merfyn frych . . .', f. 85 verso 'Plant Owein Gwynedd', f. 93 'llyma Wahelyth Deheybarth', f. 94 'kedewen', f. 99 'Dyma arfav Rys ab Morys goch . . .', f. 100 verso 'llyma Iach bleddyn ab kynfyn;, f. 101 'llyma bedwar post prydain', f. 101 'llyma Iach yr arglwydd Rys', and f. 101 verso 'llyma Iach Gryffydd ab kynan' (incomplete).

Miscellaneous papers containing lists, notes, etc., in the hand of Edward Williams ('Iolo Morganwg') bound together in one volume. The contents are extremely varied and include miscellaneous series of Welsh triads including series with the superscriptions 'Trioedd Ieuan ap Hywel Swrdwal', 'Trioedd o Lyfr Esaia Pywel sef Trioedd Llelo Llawdrwm', 'Trioedd Iaith ac Ymadrodd Iorwerth Fynglwyd', 'Trioedd Dwyfolaeth', 'Trioedd athronddysg', 'Trioedd Serch Dafydd Morganwg Bardd Ifor Hael', and 'Trioedd Esaia Powel' (pp. 1-3, 12, 14-15, 18, 24, 26, 28, 30-33, 35, 54-5, 83); lists of Welsh words sometimes with English definitions (pp. 10, 81-2, 86-7, 91-2, 101, 103, 105-06, 115-16, 120, 127, 129-33, 138, 149-52, 157- 203, 244-5, 251-4); lists of Welsh proverbs and proverbial expressions including one list headed 'Meteorological and Terracultural proverbs in Glamorgan' (pp. 28, 69-72, 77-80, 107-08, 113-14, 260-61); notes relating to the order of Welsh bards and musicians (pp. 6-7); a copy of an English poem with the superscription 'Bardic Institutes Written at Carn Moesen an ancient Druidical pile on the top of Craig y Llynn Mawr, a high mountain in the northern part of Glamorgan in Wales' (pp. 20-22); miscellaneous genealogical notes (pp. 39-42); lists [of Glamorgan relevance] headed 'Tai Cre[fydd]' (p. 47), 'Hen Gaste[lloedd] . . . Morgan' (pp.48-9), 'Llysoed[d]' (p.50), 'Hen Drefydd' (p.50), 'Glamorgan Topography' (p. 52), 'Beirdd Morganwg' (p. 56), 'Villages in Glamorgan wherein Town Halls and Market houses are still standing and kept up in good repair. They were originally used for holding markets and Baronial Courts of the Lords Marchers, now the hall is used as a school room, for dancing, . . .' (pp. 64-5), 'Present Market Towns' (p. 65), 'Antiquities in Glam[organ]' (p. 66), and 'Old names in Glamorgan' (p. 98); a short list of the names of Welsh bards, 12th - 17th cent. (p. 53); Welsh stanzas with the superscription 'Bedd bennillion a gant I. Mg.' (p. 58); notes relating to a reputed attempt by King Arthur to regulate the rules relating to armorial bearings (p. 68); a chronological list of events in British / Welsh history, 5th - 6th cent. ( pp. 73-6); Welsh verse with the superscription 'Hen ddiarhebion ar fesur dyri gan Iolo Morganwg' (p. 77); two short Cornish-Silurian lists of words (pp. 85, 88); the first lines of thirty nine 'awdlau' and 'cywyddau' ? attributed to the poet Iolo Goch 'yn Llyfr R. Jones' (pp. 96-7); 'Deuddeg Cynneddf Doethineb' (p. 117); notes relating to the poet Rhys Goch ap Rhiccart and his possible imbibing of Norman - French poetic influences ( pp. 121-2); a brief note on the 'stile and dialect and idiom' of the Welsh bards (p. 128); notes relating mainly to the Glam[organ] system and the North Wales system [of Welsh strict metres] (pp. 136-7); an incomplete account of ? rules and regulations reputedly drawn up by King Arthur at a conference at Caerleon for regulating the conduct, etc., of the Welsh bardic order (pp. 225-8); notes headed 'Llyma'r Drefn a wnaeth yr Amherawdr Arthur ar Fonhedd ag Anfonedd yr hon drefn y dylai bob bardd ei gwybod . . .' (pp. 229-34); notes relating to successive Welsh princes, etc., who had drawn up or revised codes for regulating the conduct, etc., of the Welsh bards and musicians (p. 235); miscellaneous notes relating to Welsh bardism and strict metres (pp. 236-40, 264); miscellaneous extracts of varying length from the works of various Welsh poets sometimes to provide examples of specific words (pp. 241-56); and extracts 'Ex Cwtta Cyfarwydd o Forganwg' listing the cantrefi and cymydau of Glamorgan (p. 262). In one instance the blank dorse and margins of a printed pamphlet bearing the superscription 'An Affectionate Address to Colliers, Miners, and Labouring People', 1785 (pp. 61-2, 67-8) have been used for writing notes, and in two other instances notes have been written on leaves bearing two poems entitled 'War' and 'Liberty' attributed to Morgan Williams, 1821 (pp. 109-12) and a poem entitled 'Picture of a Good Man' attributed to Edward Martin, 1818 (pp. 101-02, 119-20).