Pedigrees of North Wales families copied by Jonathan Jones, Caernarfon and others from collections made by Owen Gruffydd, Llanystumdwy, together with cywyddau and englynion by Owen Gruffydd, Robert ap Rhys Wyn, Thomas Prys and Wiliam Llyn.

A volume containing mainly pedigrees of North and South Wales families written by two principal scribes of the circle of George Owen of Henllys, Pembrokeshire.
(a) Pages 1, 7-209, 223-232, 239-256 and possibly 372-373 are written by a scribe who, although experienced in penning a good secretary hand and in executing ornate headings, is often inaccurate in his transcription of Welsh personal and place-names; he also wrote the line 'Owain ap Gruffith /i/ gelwid Gwinn ap Gr: yn jawn' on p. 41, in italic (examples of the same italic hand are found in the margins of pp. 19, 66, 113, 355, 356, 361 and elsewhere). This section comprises a collection of pedigrees mostly of North Wales families, including 'Bonedd y Saint' (pp. 84-90); the prose text 'Pedwar Marchog ar Higen oedd yn llys Arthur' (end wanting) (pp. 37-38); the dates of battles in the 'Wars of the Roses' (pp. 31, 208); five englynion, including one by Richard Davies, bishop of St Davids (p. 1), and other englynion dispersed among the pedigrees (pp. 57, 78, 92, 114-115, 170), together with the series of forty englynion entitled 'Campod Manuwel' (pp. 223-232); and the prose piece 'Disgrifiad Arfau', a Welsh translation of the heraldic treatise 'Tractatus de Armis', attributed to John Trevor, bishop of St Asaph (pp. 239-256). The ultimate source of this section is the collection of pedigrees and other texts written, [c. 1510], by 'Syr' Tomas ab Ieuan ap Deicws in Peniarth MS 127 (see p. 53); however, internal evidence suggests that the scribe was copying from the transcript of Peniarth MS 127 in NLW MS 17112D rather than directly from the original (see p. 104, where he begins copying the note 'Darfu examinatio y llyfrev newydd hyd yma' which occurs on f. 66 verso of NLW MS 17112D, before he realized his mistake). Both Brogyntyn MS I.15 and NLW MS 17112D preserve the original order of the text of Peniarth MS 127, which has been subsequently disarranged in binding. (b) Pages 211-212, 269-371, 374-411 are written by another experienced scribe whose display script is almost indistinguishable from that of the first scribe. These pages contain pedigrees mostly of South Wales families and include two copies of 'Llyma enway Kwnkwerwyr y rhai a vyant yngwlad Vorgannwg ay harfay' (pp. 280, 361-362), a third containing merely a short list of the conquerors' names (p. 310), and two copies of 'Llyma achoed Saint ynys Brydain' [= 'Bonedd y Saint'] (pp. 363-365, 385-386). The text on pp. 211-212, as indicated by a note in the hand of George Owen of Henllys at the head of p. 211, was copied in 1596 from the manuscript of 'Hyw Lewis Sr morgan' of Hafodwen, Carmarthenshire, which 'D'd ap Ienkin m'edd o Vachynlleth' wrote in 1586; the original is now NLW MS 3055D (Mostyn MS 159), pp. 232-233. The text on pp. 271-343 is partly derived from a manuscript written in 1513 by the Carmarthenshire poet and genealogist Ieuan Brechfa for 'Mastr John ap Henry ap Rees', with some of the pedigrees brought down to the second half of the sixteenth century; Ieuan Brechfa's manuscript does not seem to have survived; it is not Peniarth MS 131, pp. 199-308, which is thought to be in his hand. The source of pp. 345-411 is unknown, although the text on pp. 347-365 follows very closely that in Peniarth MS 143, pp. [?1-3], 4, 47-48, 7-19, 33-46, 49-52, written by the same mid-sixteenth century scribe who wrote many of the religious texts in Cardiff Central Library Havod MS 22. A leaf containing a prophecy in English verse, written in a late-sixteenth century hand, has been tipped in after the main text (pp. 413-414).

A commonplace book containing prognostications, weather lore, chronology, calendars, a table of Easter dates for 1600-1701 compiled by Rice Jones in 1598, an account of the English alphabet, historical 'englynion', and miscellaneous verse. The volume belonged in the eighteenth century to David Jones, Trefriw, who copied into it extracts from William Salesbury: A Dictionary in Englyshe and Welshe ... and from the almanacks of Thomas Jones, and some genealogical memoranda.

An index, prepared by Walter Davies, of proper names, mainly Welsh personal and place-names; englynion and other poems; and miscellaneous notes.

A manuscript containing an incomplete interlude which has been identified as a part of 'Mynegiad yr Hen Oesoedd ...' by Thomas Williams, merchant-tailor of Talybont, Caernarvonshire, and others (London, 1761); Thomas Williams's manuscript also contains englynion, carols and triads.

Transcripts of two pastoral poems by Edward Richard, Ystradmeurig, englynion, and a satire on a vicar of Caio.

'Englynion', etc., by John Jones ('Tegid'), Evan James, Robert Davies ('Bardd Nantglyn'), Walter Davies, Hugh Hughes ('Y Bardd Coch'), Roger Wynn, Richard Jones ('Gwyndaf Eryri'), etc., and miscellaneous notes by Walter Davies.

Fragments of manuscripts containing 'awdlau', 'cywyddau,' 'englynion', and 'penillion' by some of the Cynfeirdd and Gogynfeirdd and by Dafydd ab Gwilym, Dafydd Edwards ('or Bistog') Morys ab Edwart, Sion Phylip, Capt. Wm. Salisbury, Ieuan Llwyd Sieffre, Rowland Vaughan, and Ellis Sutton.

Cywyddau and englynion by Morus ap Rhisiart Morus, Robert Hughes ('o Geint bach'), Lewis Morrus, Evan Evans, William Wynn (Llangynhafal), Llywarch Hen, Mabclaf ap Llywarch, Elaeth, Sion Powel, and anonymous writers; a letter by Evan Evans; triads, pedigrees, and notes.

'Cywyddau' by Edwart ap Raff, Dafydd Llwyd ap Llywelyn ap Gruffudd, Huw ab Elis, Robert ab Ieuan ap Tomos, Humphrey Thomas Gruffudd, Sion Phylip, Tomos Penllyn, Maredudd ap Rhys, Wiliam Llyn, Sion Tudur, Rhys Cain, Morys Cyffin, William Byrchinshaw, Robin Clidro, Morys ab Ieuan ab Einion, and Guto'r Glyn; 'englynion' transcribed by Edward Lloyd in 1747 from 'Llyfr Maelor'; and fragments of hymns by William Williams (Pantycelyn) and others.

A manuscript containing transcripts of englynion and other poetry.

Transcripts by Walter Davies of englynion and other poems, mainly from a manuscript of Margaret Davies, Vron Wion, and miscellanea.

'Llyfr Cowyddeu i Mr. William Wynn o Langoed yn sir fon'. 'Y Llyfr hwnn a scrifennodd William Davies Curat or plwy yn y flwyddyn o oedran yr Arglwydd: 1642'. It contains 'cywyddau', 'awdlau', and 'englynion' by Sion Cent, Iolo Goch, Syr Owain ap Gwilym, Syr Dafydd Trefor, Sion Phylip, Dafydd ap Gwilym, Ieuan ap Gruffudd Leiaf, Dafydd Nanmor, Llywelyn ap Hywel ab Ieuan ap Gronw, Edmwnd Prys, Huw Cowrnwy, Dafydd ap Dafydd Llwyd, Maredudd ap Rhys, Gruffudd Llwyd ap Dafydd ab Einion, Sianckyn ab Eingan, Llywelyn ab yr Ynad Coch, Sion Tudur, Morys ap Hywel ap Tudur, Sion ap Hywel ap Llywelyn Fychan, Huw Roberts, Morgan ap Huw Lewis, Sion Brwynog, Morys Llwyd, Hyw Arwystli, Lewis Morganwg, Dafydd Llwyd ap Llywelyn ap Gruffudd, Lewis Daron, Rhys Nanmor, Hywel ap Dafydd ab Ieuan ap Rhys, William Egwad, Hywel Swrdwal, Tudur Aled, Lewis Glyn Cothi, Lewis Môn, Rhys Goch Glyndyfrdwy, Guto'r Glyn, Gruffudd ab Ieuan ap Llywelyli Fychan, Wiliam Myddelton, Bedo Brwynllys, Wiliam Llyn, Lewis Menai, Simwnt Fychan, Llywelyn ap Gwilym ap Rhys, Richard Cynwal, Rhys Cain, Gruffudd ap Tudur ap Hywel, Sion Ceri, Robert ap Dafydd Llwyd, Syr Roland Williams, Gruffudd Hiraethog, Wiliam Cynwal, Morys Dwyfech, Rhys Goch Eryri, Roger Cyffin, Gwilym ap Sefnyn, Ieuan Dew Brydydd, Thomas Prys, Gruffudd Llwyd, Dick Hughes, and the transcriber.

A seventeenth century transcript of 'cywyddau' and 'awdlau' by Huw Machno, Dafydd ap Gwilym, Sion Cent, Sion Tudur, Dafydd Nanmor, Iolo Goch, Tudur Penllyn, Guto'r Glyn, Tudur Aled, Ieuan Deulwyn, T[h]om[a]s Derllys, Robert Leiaf, Wiliam Llŷn, Sion Brwynog, Robin Ddu, Gruffudd Hiraethog, Lewis Daron, Owain Waed Da, Hywel Cilan, Dafydd ab Edmwnd, Rhys Goch Eryri, Sypyn Cyfeiliog, Lewis Glyn Cothi, Iorwerth Fynglwyd, Ieuan ap Tudur Penllyn, Lew[y]s Morganwg (Llywelyn ap Rhisiart), Deio ab Ieuan Du, Bedo Brwynllys, Wiliam Cynwal, Huw Arwystli, Mor[u]s Dwyfech (Morus ap Dafydd ab Ifan ab Einion), Bedo Phylip Bach, Sion Phylip, Maredudd ap Rhys, Lew[y]s Môn, Ieuan ap Gruffudd Leiaf, Richard Phylip, Rhys Goch Glyndyfrdwy, Ieuan ap Rhydderch ab Ieuan Llwyd, Gruffudd ab Ieuan ap Llywelyn Fychan, Dafydd Llwyd ap Llywelyn ap Gruffudd, Llywelyn ap Gutun [ap Ieuan Lydan], Sion ap Robert ap Rhys, Dafydd Benfras, Bleddyn Fardd, Edmwnd Prys, Gwilym ab Ieuan Hen, Syr Dafydd Trefor, Gruffudd Phylip, Ifan Llwyd (Gwaun Eingian), Edwart Ifans and Rhys ap Robert ap Hywel; 'englynion'; a vocabulary of old Welsh words; genealogies of the Lloyd family of Dulassau, etc.

Carols and other poems by John Thomas (Pentrefoelas), Thomas Edwards (Twm o'r Nant), Jonathan Hughes, Richard Pryce, Walter Davies, Humphrey Jones, and Lewis Evans (Pengwern); englynion; and miscellanea written mainly by Walter Davies and including an alphabetical catalogue of precious stones and metals.

Transcripts, mainly by Richard Lloyd, minister of the Welsh Calvinistic Methodists at 'Beamaris' about 1818, of cywyddau, englynion, odes, and carols by John Roberts (Sion Lleyn) and Rhisiart William Dafydd, and transcripts of letters to Richard Lloyd relating to Welsh Calvinistic Methodist affairs in Anglesey, 1828-1834.

Transcripts of cywyddau and englynion by Sion Tudur, Edward ap Raff, Wiliam Cynwal and others; an abbreviated version of Hystoria Lucidar (cf. Lanstephan MS. 117 and Mostyn MS. 144); lives of Saints Margaret and Catherine; Trioedd Taliesin; and an index of contents by Lewis Morris.

Copies of 'cywyddau' by Guto'r Glyn, Hywel Cilan, Edward ap Raff ('prydydd dall oedd ef, 1587'), Rhys Cain (1598), Sion Brwynog, William Llŷn, Hywel Gethin 'o Gelynog', Rhys Pennardd, Hywel Rheinallt, and Gruffudd Llwyd ab Ieuan; a carol dated 1598; an 'englyn'; music miscellanea ('y pedeir caing ar ddec', 'y pedeir gostec', 'Klymav'); and prose 'areithiau', 'Dewis-bethau Davydh Meilienydh', 'Breudhwyt Gruff. ap Adha ap D'd', and 'Breudhwyt Llewelyn Goch ap Meuric Hen'. The latter portion of the manuscript is in the hand of Thomas Williams, 'physycwr'.

'Cywyddau', 'englynion', 'carolau', 'cerddi', etc., with a few English items. Among the authors represented are Huw Morus, Simwnt Fychan, Richard Abraham, Ifan ap Maredudd, Wiliam Llyn, Dafydd ab Edmwnd, John Roberts, 'R.T.', Sion Tudur, Edward Rowland, Samuel Williams, Thomas Prys, 'Mr. Gruffith', Wiliam Cynwal, Iolo Goch, Gruffudd Llwyd, Robin Clidro, Robin Ddu, Owain ab Owain Gwynedd, Huw Lewis, Dafydd Llwyd ap Llywelyn ap Gruffudd, Dafydd ap Gwilym, Lewis Menai, Huw Arwystli, Dafydd Johns ('Vickar llannfair' [?Dyffryn Clwyd]), Lewis Dwnn, James Dwnn, Dafydd Emlyn, and Richard Fychan.

'Cywyddau' and 'englynion' by Ellis Rowland, Syr Dafydd Trefor, Thomas Prys, John Davies, Siôn Tudur, Edward Morus, Rowland Price, Wiliam Phylip, Gruffudd Prys, Owen Gruffydd, Dafydd ap Gwilym, Cadwaladr Cesel, John Roger, Huw Morus, Dafydd Manuel, Richard Abram, Mathew Owen, Edward Williams, William Wynn, Margaret Davies, Rhys Jones, Hugh Hughes, and E[dward] Wynne, [Gwyddelwern].