Letters to Mary Owen (née Godolphin), wife of William Owen of Brogyntyn, 1730-1784, mainly from her immediate family, Godolphin and Owen relatives, friends and other close associates. They constitute a rich, lively source of information on the personal, domestic and social circumstances of an eighteenth century gentry family. Many of the letters reflect Mrs Owen 's own interests in music, theatre, literature, political news and high society gossip among her contemporaries. Recurrent topics include the ecclesiastical career of Lewis Owen; renovations at Porkington, 1735-1743; the estates of Richard Clayton and Arthur Owen; Elizabeth Longueville 's settlement; Jacobite disturbances; elections in North Wales and Shropshire; church preferments in England and Wales; and court life under the Hanoverian royal family, 1731-1752.

Letters to Margaret ('Peggy') Godolphin, [c. 1698]-1764, mainly of a personal nature, from Godolphin family members, 1703-1764, other relatives and friends, and official correspondence from solicitors and agents. General topics not previously mentioned in detail include the practical problems of administering the Abertanat estate with inefficient agents, financial shortages, poaching activities and litigation with neighbouring landowners; Margaret Godolphin 's purchases of Maesgwyn, 1756, and Moreton Hall, 1760-1764; the inheritance of Broniarth manor and the rest of the Abertanat estate; a church preferment in Shropshire, 1760; and problems incurred by the turnpikes near Oswestry, 1756. Of particular interest are the family letters from Ellen and Francis Godolphin on the upbringing of the Owen children, fashion, high society gossip and the Hanoverian court, including the accession of George II, 1727.

Papers of the Rev. C. Tawelfryn Thomas, 1837-1938, comprising letters addressed to him from religious, literary and political figures, 1874-1938, mainly about biographical details of historical and contemporary ministers and poets, eisteddfod competitions, publication of books and articles, including Thomas's own work on Ieuan Gwynedd, the Independent College in Bala, personal matters, preaching engagements and ministers' appointments; stanzas composed by him; and poetry by William Cosslett (Gwilym Elian) and others, 1837-1903.