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.

Prose, poetry, ballads, essays, letters, speeches (some parliamentary), broadsides, press articles, material copied from printed works, and notes, both satirical and non-satirical, relating to British politics from the second Civil War to the accession of Victoria, including relations with European powers. They display a variety of political sympathies concerning George I, James Stuart (the 'Old Pretender'), Queen Mary, Queen Anne, the Duke of Marlborough, and other figures in British politics, as well as Robert Myddelton's election to Parliament in 1722. Many of them are mostly undated, but most of them appear to have been composed between the 'Glorious Revolution' and the Hanoverian succession, which are the main topics. Also included are a printed volume detailing the royal houses of Europe, a copy of a letter from an Austrian ambassador, accounts of military engagements at sea and in the Low Countries, and a few writings on religious and ecclesiastical subjects.