Pedigree charts and explanation notes showing the descendants in the United States of Richard Thomas and Mary Charles, originally from Bryncroes, Botwnnog, Caernarfonshire, who emigrated to New York in 1795.

Dalen yn cofnodi genedigaethau, priodasau a marwolaethau (dyddiadau rhwng 1794 a 1835) plant Griffith Williams (Gutyn Peris) ac Elisabeth ei wraig, [?1819]-[?1835] (dyfrnod 1818). = A leaf recording the births, marriages and deaths (dates between 1794 and 1835) of the children of Griffith Williams (Gutyn Peris) and his wife Elisabeth, [?1819]-[?1835] (watermark 1818).

A volume, [late 18 cent.]-[1840s], containing pedigrees, in several hands, mostly of Anglesey and Caernarvonshire families. The earlier portions, [late 18 cent.] (pp. 37-140), were copied mostly from Llyfr Melyn Tyfrydog (now NLW MS 23969F); later additions, [?1820s] (pp. 5, 151-283), are derived from the Taicroesion Manuscript (now NLW MS 19058E and Bangor MS 13564) or from intermediate copies.
A note by Jonathan Jones of Caernarfon in NLW MS 825D (inside front cover), dated 1855, describes the present volume as having been copied 'about 60 years ago from Llyfr Melyn Tyfrydog' by Robert Jones, for John Price (d. 1804) of Mona Lodge, Amlwch, with the pedigrees being continued by Price's son, John Price of Cadnant. The volume also includes descriptions of the Five Royal Tribes of Wales and the Fifteen Tribes of Gwynedd, partly in Welsh (pp. 137-150), and various antiquarian notes and statistics [in the hand of John Price of Cadnant] (pp. 290-355), including lists of Anglesey Sheriffs to 1843 (pp. 309-323), and transcripts relating to Amlwch parish church (pp. 341-347). Items loose within the volume, including a pedigree of the Bulkely family in the hand of John Price (watermark 1825), and a newspaper cutting, [1881], listing Caernarvonshire landowners, have been placed in an archival envelope. The contents of the manuscript are listed on pp. i-iv, 1-2.

A copy, in three volumes, of the history of the Welsh side of the donor's family, and that of his late wife, Rosemary, who hailed from Devon, the results of research undertaken between 1979 and 2001, entitled 'The Mattabel Inheritance'.