A manuscript in two hands containing mainly poetry of Taliesin, Iolo Goch, Dafydd ab Edmwnd and others; also pedigrees of British rulers (pp. 6, 14-27, 29), which include englynion chronicling the history of British rulers from Brutus (pp. 16-22).
A manuscript containing the 'grammar' of Dafydd Ddu o Hiraddug (fl. before 1400), i.e. his 'llyfr cerddwriaeth' dealing with the structure and art of bardism and verse. A note on p. 31 records that this manuscript was copied from a book belonging to Wiliam Llŷn (1534 or 5-1580), which had in turn been copied from a book belonging to Dafydd ab Edmwnd (fl. 1450-1490). Cf Mostyn MS 110, Jesus College MS 9, Peniarth MS 62, etc.
A manuscript, apparently in the hand of John David, containing a transcript of Rawlinson MS C. 821 (pp. 1-107); 'Am ossodedigethau Dyfnwal ... moel ...' (pp. 109-110); excerpts, in Welsh, from a very old manuscript of the Laws which was in the possession of John Edwardes of Chirk (pp. 111-128); 'a lettre & exposition of Welsh words in Hoel Da's lawes written to Mr. ffr. Tate [Francis Tate, who has a note dated 23 January 1613 at the end of Vesp. E. XI] ...' (pp. 129-131); and 'The exposition of words' (pp. 132-148).
A manuscript containing the laws of Hywel Dda in Welsh. A note in the hand of Moses Williams reads as follows: 'The original MS. (Bibl: Cott: Titus D. IX) whence this was copy'd from was lost in the fire A.D. 1731. So this is the only perfect Copy of this class'.
A manuscript in the hand of Moses Williams containing 'Kelvyddyd kerdd Davod' (ff. 1-5a), being a copy of pp. 10-16 of Llanstephan MS 28, with a note stating that 'This imperfect Tract I transcribed out of a MS. writ by Guttyn Owain A.D. 1455 & communicated to me by D Foulkes of Llanbedr Dyffryn Clwyd.'; and an extract 'Out of Huw Machno's Book' (ff. 5b-12b) outlining the fifteen faults which may be committed when writing Welsh verse, with examples. The text cites a line from Wiliam Cynwal.
A manuscript containing a copy of Aristotle's Book of Physiognomy (originally written by Aristotle for Alexander the Great) (ff. 1-9) (cf. Jesus College MS 7, p. 48); material relating to astrology (ff. 10-26); and Traethiad Robin Moyses (ff. 26-28). The two works contained in ff. 1-19 are copied from a manuscript written by John Jones, Gellilyfdy in 1604, which was copied by Jones from a manuscript written in 1476.
A manuscript in the hand of Moses Williams containing the Interpretation of Dreams from Llanstephan MS 28; and 'Gr. ap kynan twssog kymry a wnaith gyfreth ar y gwyr wrth gerdd' in a seventeenth century hand.
A manuscript containing lives of saints, etc. An index is included on p. i. Pp. i, 427-433 are in the hand of Moses Williams. A note - 'Pretium £1 . 4 . 6 An. 1715' - on the fly-leaf is in the same hand as most of the manuscript. At the end of the Life of St Margaret, which begins at p. 427, the scribe has written 'Felly y terfyna buchedd saint y Marged a esgrifenodd Tho: Evans 1628 fis Mawrth 5 dydd'.
A manuscript containing ''The Art of Contentment' or Addysc i foddlonrwydd', translated into Welsh apparently by 'Nathanael Jones Esq. anno ætatis suæ 57' (p. 130).
A manuscript in the hand of John Jones, Gellilifdy, who in turn had copied from a manuscript dated 1531 (see f. 20), containing 'Ymddiddan rwng y verch aniwair ar gwr ieuangc o waith Grasmws o Rodam', and the Elucidarium.
A miscellaneous collection of prophecies, etc. in prose and verse (including those of Myrddin and Taliesin), probably in the hand of William Phylip. There is a table of contents by Richard Morris at the beginning, written April 1748 for William Jones.
A manuscript containing Welsh poetry, the poets including Iolo Goch, Edmwnd Prys, Gutun Owain, Tudur Aled, Guto'r Glyn and Sion Phylip. This forms one of the series of manuscripts of Welsh poetry copied under the superintendence of Dr John Davies, Mallwyd, and bears the reference B. 4°. Wherever the copyist failed to read the original he left blanks which Dr Davies filled in throughout the volume. Dr Davies also added an index, alphabetically arranged, to first lines of poetry (p. 567); added to this is an index to the authors of the poems, also alphabetically arranged, which bears the inscription 'Rhisiard Morys ai Sgrifennodd i Wm: Jones R.S.S. 1747' (pp. 577-588).
A manuscript containing theological tracts (pp. 408-435), Yspryt Guido Ar Prior (pp. 436-471), Kerdwriaeth Kerd Davawd and Trioed Kerd (pp. 472-504). The first folio is rubbed, stained and mostly illegible. The text of pp. 408-421, l.8 is practically identical with that published in Llyvyr Agkyr Llanwivrevi (Oxford, 1894), pp. 141-51, l. 3, but wanting the text on p. 144, l. 21 to p. 148, l. 26. The ending of Trioed Kerd is illegible. This manuscript is a continuation of 'Didrefn Gasgliad' Vols I & II.
A manuscript containing Brut y Tywysogion interspersed with the remarks and comments of Dr Powel's edition of H. Lloyd [Humphrey Llwyd]: Historie of Cambria now called Wales (1584) (although certain references in the margins to the pages of Dr Powel's edition do not tally with the 1584 edition). The compiler has also added comments of their own in English, and continued the history down to 1544.