Family papers and estate records, 1370-1941, of the Baker-Gabb family of The Chain, Abergavenny, Monmouthshire, and their antecedents, mainly deeds and documents relating to lands in Monmouthshire and Herefordshire, mainly from the second half of the sixteenth century, when the Bakers first appear as stewards of the lordship of Abergavenny, including deeds relating to the town and castle of Abergavenny, the Priory of Abergavenny, and the Priory of Llanthony Prima; records of the following Monmouthshire manors: Cwmyoy, Llanthony, Stanton, Redcastle, Oldcastle, Triley, Abergavenny, Ewyas Lacy, Crickhowell, Hothneslade, and Newton or St Margaret's from 1632 onwards, including court books, perambulations and rentals; a breviary in the English style of the fourteenth-fifteenth century (NLW MS 16147A); papers relating to David Lewis, Catholic bishop of Llandaf, including his speech at the place of his execution, 1679; and diaries etc. of John Baker Gabb, private chamberlain to Pope Leo XIII, 1859-1892; a poll of burgesses of Monmouth, Newport and Usk, 1715, and material on the genealogy of the Baker Gabb family. -- Many of the letters and deeds belong to the solicitor's practice established by Thomas Gabb in 1760.

Llangibby Castle estate records, including court rolls of manors in Monmouthshire, 1262-1911, Glamorgan, 1675-1739, Gloucestershire, 1427-1595, and Somerset, 1609-1691; title deeds, mainly Monmouthshire, 1217-1930, and correspondence, mainly 18-19 cent.; important letters and papers relating to the civil war in Monmouthshire; and manuscripts aquired by the family, including drafts and copies of Modus Tenendi Parliamentarum and Observata Parliamentaria by Henry Elsynge, junior (1598-1654), clerk to the House of Commons, together with minutes of the House of Commons, 1624-1626, calendar of the Journal of the House of Lords, 1647-1768, copies of the Journals of the House of Commons, 1547-1701, index to parliamentary proceedings, temp. Edward III-Edward IV, and, 1724-1743, civil war tracts, the journal of the missionary Dr Joseph Wolff, 1832, 'Prif Achae holh Gymru Benbaladr' in the autograph of Sir Thomas Wiliams, Trefriw, 1578-1609, a seventeenth-century collection of Welsh poetry by the principal 'cywyddwyr'; a memoir of Richard Robert Jones ('Dic Aberdaron', 1780-1843) in his own autograph; English sermons and miscellaneous notes by Rev. Edmund Jones, Pontypool, a sermon notebook of Rev. Philip Henry (1631-1696), the eminent Nonconformist divine, a survey of the lands of Henry, earl of Pembroke, in Glamorgan and Monmouthshire, 1570, and a survey of lands in the lordship of Usk, 1619; pedigree rolls of Sir Roger Williams of Penrhos, Monmouthshire, compiled by Thomas Jones ('Twm Siôn Catti'), 1591, and of the Williams family of Llangibby Castle, probably compiled by Sylvanus Morgan.

Records of the Morgan family of Tredegar and Ruperra, later barons and viscounts Tredegar including deeds, 14th-20th cent. of the Tredegar, Ruperra, Dderw and Palleg estates in Monmouthshire, Glamorgan and Breconshire which document much of the growth of the towns of Newport and Cardiff in the 19th century; records of the lordship of Wentlloog (Newport) and many Monmouthshire manors, some 14-16 cent., but mainly 17-19 cent.; records of the manor of Brecon and of other manors in Breconshire, 17-19 cent. including the Great Forest of Brecon; records of industrial interests, mainly coal and iron in Glamorgan and Monmouthshire, 18-20 cent.; records of the Tredegar Wharf Company from 1807; and surveys, audit books, rentals, ledgers and leases for the Monmouthshire, Glamorgan and Breconshire portions of the Tredegar estate, 18-20 cent.; papers relating to Nova Scotia and Canada, 1730-1773, mainly of Richard Phillips, Governor of Nova Scotia, 1717-1749; and rentals and leases for the Mile End and Bow estates in London, 19-20 cent.