A manuscript containing a collection of Welsh arms and pedigrees compiled and abridged from the works of several authors during the years 1697-1698 by John Gruffydd of Cae Cyriog, Ruabon, here transcribed and rendered into English by William Jones of Llangadfan. P. ix contains 'A list of the Heralds and Genealogists from whom the author compiled the following Book and the dates of their MSS'; amongst the names mentioned are Gutun Owain, William Salesbury of Rhug, John Salisbury of Erbistock and Foulk Owen of Nantglyn. At the beginning of the volume are loose papers which include two letters in the autograph of Walter Davies ('Gwallter Mechain'), one of which is dated 3 June 1799 and relates to the Board of Agriculture. At the end of the volume (pp. 155-166) are copies of letters from Robert Vaughan concerning Gwaithfoed, Lord of Cardigan, with a reply from Mr Kynaston of Pant y Byrsley.

A manuscript written c. 1634 (see p. 165) containing pedigrees (pp. 164-166, 189-215, 217-243); Bonedd y Saint (pp. 87, 216); 'Dosbarth Arveu' (pp. 167-188); proverbs (pp. 160-162); triads (pp. 259-260); 'Cantrevyd a chymydeu Cymru' (pp. 244-245); medical recipes (pp. 249-258); &c.
The manuscript is in the same hand as Llanstephan MSS 122-125 and may be that of John Pryce, rector of Mellteyrn (see p. 103).

A manuscript containing a chronology, mainly of kings and rulers of Wales (pp. 1, 33-37, 43-48, 49-60, 100, 111-113); arms, mainly of kings and rulers of Wales (pp. 2-8, 9, 99); pedigrees, mainly of kings and rulers of Wales and England (pp. 9b-88, 89-98, 224-152, 155-158, 164-186, 188); and poetry, which includes triads (pp. 38-42, 100-110, 159-163, 187, 190).
The folios of different manuscripts, or of one manuscript written by different hands at different times, have been mixed together in binding.