A manuscript containing Brut y Brenhinedd, after 'Ifan Llwyd ap Dafydd o Nantmynach o fewn Sir Feirioydd [sic], Esquier'. Pp. 1-9 are in the hand of the Reverend Moses Williams.

A composite, imperfect text made up of parts of two independent manuscripts, with the early chapters by a third hand; all three hands belong to the same type or school of writing, and cannot be separated by many years.
Hand A (pp. i, 1-25) has 21 lines to the page, with two-line rubric initials to chapters. This is the work of a hand like that in British Museum Caligula MS A. III, i.e. the C manuscripts of the Laws. These early folios were probably written to fill in the lacuna at the beginning of the principal fragment; however, the first and second folios are now wanting. The text corresponds with p. 477, col. 1, l. 5 to p. 482, col. ii, l. 15 of the Myvyrian Archaiology of Wales (Denbigh, 1870). Hand B (pp. 26-101, 146-205) has 30 lines to the page with two-line rubric chapter initials, and rubric headings to certain chapters as in the Myvyrian Archaiology, p. 482, col. ii, l. 15 to p. 511, col. i, l. 29, (531-3), 534-7, l. 3, [lacuna] 538, l. 30 to 539, col. ii, l. 21, (539, col. ii, l. 21 to 540), [lacuna] 541, col. ii to 542, l. 41), [lacuna] (543, col. i-ii, l. 12), 543, col. ii, l. 13 to 545, col. i, (545, col. ii to 547, col. ii, l. 32), 547, col. ii, l. 33 to 553, col. ii, l. 28, (553, col. ii, l. 29 to 554) (where bracketed figures denote text which is summarised in the Myvyrian Archaiology). Hand C (pp. 102-145) has 32 lines to the page, with rubric chapter initials floriated with green, now faded. These folios form the ivth and vth quires of Peniarth MS 44. The text of this version is not in close agreement with that in the Myvyrian Archaiology (p. 510, col. i, l. 48 to p. 531), though the wording is frequently nearly the same. There is a folio wanting between pp. 131 and 132, and between pp. 139 and 140.

A manuscript, written in two hands of the first half of the sixteenth century, containing Brut y Brenhined, the text also including the Prophecy of Myrddin.
The fly leaf has a note (1749) on the manuscript by Lewis Morris, who calls the manuscript Brut Tyssilio; there is another note by him at the end of the manuscript.

A transcript, in the hand of Evan Evans (Ieuan Fardd), of 'Brut Gruf. ab Arthur', a compiled version of Brut y Brenhinedd 'transcribed from a very old copy of the British History on Vellum' (NLW MS 1978iB, ff. 1-109 verso, and NLW MS 1978iiB, ff. 110-261 verso); together with copies of correspondence, 1758-1765, of Edward Richard of Ystrad Meurig School and Lewis Morris, relating to Ieuan Fardd, Morris's health, literary criticism and Celtic antiquities, with special reference to Camden and Nennius (NLW MS 1978iB, ff. 111-192); and copies of two letters from 'Dr. Phillipps' [the Rev. James Phillips], Blaen y Pant, to Edward Richard (NLW MS 1978iB, ff. 192-194). Also included is a table of contents (ff. 195-196) and a pedigree of St David (f. 261 verso).
The text of Brut y Brenhinedd was the original of the text of Brut Gruffydd ab Arthur printed in the second volume of the Myvyrian Archaiology of Wales.

A table of British Chronology from Brutus to Caswallawn in the autograph of John Thomas, Tu hwnt i'r bwlch; an account of a tour from London to Falmouth, 1759; 'Marwnad John Griffith Yswain diweddar o Gefnamwlch' by Ifan ab Risiat alias Ieuan Lleyn, 1794; poems written between 1861 and 1864 by Owen Gethin Jones; and an essay 'Cyfiawnder yn safon cadwedigaeth' submitted for competition at Arwest Glan Geirionydd, undated.

A manuscript in three hands containing a treatise on arms addressed to Morgan Elfael (fl. c. 1528-1541) from Hywel ap Syr Mathew (d. 1581); also poetry, etc. Pp. 1-165 are in the autograph of Hywel ap Syr Mathew and were written in 1557 (cf. the writing in Peniarth MS 138 and Cardiff MS 51); pp. 167-194 are in a second hand and written about 1598; pp. 195-204 are in a third hand and were written about 1600. The poets whose works are cited include Dafydd ab Edmwnt, Siôn Cent, Gruffudd Hiraethog and Iolo Goch. The volume also contains medical recipes (pp. 166-170) and a chronicle of the reign of British rulers (p. 198).