Topographical, historical, and genealogical material relating mainly to the counties of Anglesey, Caernarvon, Denbigh, Merioneth, Montgomery, and Shropshire, accumulated by Thomas Pennant and including letters or other contributions from Paul Panton, Hugh Davies (botanist), E. R. Owen (Bangor), John Thomas (Llandegai and Beaumaris), John Lloyd (Caerwys), Sir John Cullum (Hardwick), Richard Thomas (Llanegryn), Thomas Bownall (London), Thomas Jones (Caernarvon), George Ashby (Cambridge), John Price (Oxford), Thomas Ford Hill (London), Foote Gower (Chelmsford), Francis Leighton (Shrewsbury), J. Plymley (junior), J. Worthington (Llanrhaiadr ym Mochnant), Thomas Addenbrooke (Buildwas), David Pennant, and Richard Gough (Enfield).

Notes, [c.1680], on the descent of the whole Herbert family, including the Herberts of Pembroke, Coldbroke, Powis Castle and Cherbury.

Pedigree, dated 1687, of Richard Herbert of Dolforgan, Kerry, Montgomeryshire, containing nineteen coats of arms, all painted, tracing Herbert's lineage, in the male line only, through fifteen generations, [?spuriously] from King Henry I and his son Herbert [?recte Henry] fitz Roy.
Husbands and wives are recorded in roundels beneath their impaled coats of arms; additional coats have been included to represent Herbert's wife's parents and maternal grandparents, and his daughter. Three generations have been added to the pedigree in a different hand (without heraldry), while further additions have been roughly sketched in pencil, [18 cent., last ¼]. Eight roundels have been left empty. The compilers of the pedigree are not named, however the Rev. John Jenkins (Ifor Ceri) ascribes it to Morris Evans of Llanfyllin, antiquary, and 'John Richardson, Herald Painter' (see NLW MS 1655B, f. 8; the repetition of this attribution alongside other pedigrees in the same volume (f. 13 verso) may cast doubt on its accuracy however). A dedication at the foot of the pedigree lists the authorities consulted (in NLW MS 1655B, f. 9 verso, Ifor Ceri appends the same list to a different pedigree altogether).

Pedigrees (54 pp.) of various families in Caernarvonshire (Llŷn and Eifionydd), Montgomery, Merioneth, Denbigh and Anglesey, etc. transcribed by John Jones ('Myrddin Fardd') from an unnamed source or sources, possibly early eighteenth century. The first page is marked 'Copy No. 28'. A loose press cutting in the volume contains a carol ('Carol Newydd') by [Gruffydd Roberts] 'Gyttyn Lleyn'.

Pedigree of the Rogers family, [1936x1943], probably compiled by the Very Rev. Edgar Rogers. The family included Edward Rogers of Dolobran, Montgomeryshire.

Transcripts of miscellaneous entries of baptisms, marriages, and burials from the parish registers of Cemmes, Mallwyd, Machynlleth, Penegoes, Trefeglwys, Llanwnog, and Darowen; genealogical notes and extracts relating to individual families, e.g., Tibbott of Llanbrynmair, Swancott of Trefeglwys and Llanwnog, and Bowen of Trefeglwya; lists of Bennett marriages, burials, and baptisms, 1631/2-1859, from the parish registers of Trefeglwys, Llanbrynmair, Llanidloes, Llangurig, Carno, and Llandinam; transcripts of miscellaneous memorial inscriptions; extracts from printed matter; etc.

Extracts from memorial inscriptions in the churchyards of Llanllugan, 1817- 1910, Trefeglwys, 1833-1847, Llanwyddelan, 1783-1887, and Manafon, 1865-1908; transcripts of miscellaneous entries of baptisms, marriages, and burials from the parish registers of Tregynon, 1689-1800, Manafon, 1689-1784, and Carno, 1755-1836; abstracts of title deeds of the families of David of Garthbwt [Llanwnnog], 1679-1816, and Bennett of Glanyrafon, Trefeglwys, 1546?-1795; genealogical entries extracted from family Bibles, etc.; extracts from a diary ('Hen Lyfr y Parch. R. H. Jones') recording preaching tours of Merionethshire, Denbighshire, Flintshire, and Montgomeryshire, 1819-1822; and genealogical notes and extracts from printed and manuscript sources.

Transcripts of miscellaneous entries of baptisms, marriages, and burials from the parish registers of Llawryglyn, Llanbrynmair, Cemmes, Mallwyd, Dolgelley, Talyllyn, and Llanwnog; extracts from memorial inscriptions in the churchyards of Llan[bryn-mair], 1786-1791, Yr Hen Gapel [Congregational Church, Llanbryn-mair], 1845-1895, Cemmes, 1722-1773, Llanwrin, 1701-1891, and Llanwnog, 1757-1822; genealogical notes relating to the families of Anwyl, Jones of Cilfach y Rhiw, etc.; extracts, 1806-1824, from the manuscript diaries, etc., of the Reverend John Elias ('o Fôn') at Bala College [now part of the C. M. Archives deposited in the National Library of Wales]; miscellaneous extracts from printed and manuscript sources; and lists of 'Lla[nbryn-mai]r persons married to outsiders', 1663-1747, and of 'Outsiders buried at Llanbrynmair', 1663-1747.