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 Emily Charlotte Ormsby-Gore (née Seymour), second Lady Harlech, 1844-1876, from her husband, William Richard Ormsby-Gore, and children, 1853-1874, other relatives and friends, including Lady Clinton, [1844], Mary Jane Ormsby-Gore [c. 1869], the Duchess of Grafton, 1860, Lady Georgiana de Ros, [1860], her father, Sir George Francis Seymour, 1857-1869, her cousin, Lady Spencer, 1857-1870, and other members of the Seymour family, 1850-1876. Particular topics are: her husband 's experiences in the Crimean War, 1853-1854; charitable works, estate business and court duties in Ireland; elections in Shropshire and Roscommon, 1859; the Franco-Prussian War, 1870; Sir George F. Seymour 's involvement with the 68th regiment and recollections of the Walcheren expedition in 1809; the marriage of Laura Wilhelmina Seymour to Prince Victor Gleichen, 1860; and events in Canada during the American Civil War, 1862. The file also includes a single family letter to her daughter, Mary.

Letters received by William Owen, [c. 1705]-1767, together with a number of copies or drafts of his replies. Some of the letters are from members of the Godolphin and Owen families, [c. 1705]-1758, and others are from solicitors, bankers, national figures and local gentry, including several from Edward Wynn(e) of Bodewryd. General topics include charitable bequests and legacies by Anne Jones of Clenennau, [c. 1705]-1716; William Owen 's role in local government; elections in Shropshire and North Wales, particularly corrupt practices in the Caernarfon Borough elections for 1713 and 1722; improvements to Brogyntyn (Porkington) Hall, 1734; the appointment of Dr Hutton as bishop of Bangor, 1743; the Jacobite Rebellion, 1745-1746; the purchase of Dolbenmaen, 1735; litigation relating to the estates of Richard Clayton and Arthur Owen, 1740-1760, boundary disputes in Gest and Penyfed, and quarrels with Margaret Lloyd of Cesail Gyfarch, 1741. The last file contains correspondence between William Owen, Edward Wynn(e), a Flemish lawyer and others, in an attempt to prove his claim to £500 out of the Bodysgallen estate, following the death of a distant kinsman John Francis Ouwens, 1710-1711, 1785.

Letters to Margaret Ethel Ormsby-Gore, mainly from various friends and her relatives in the Ormsby-Gore family. Subjects comprise family marriages; the history of Owen, Gordon (Earls of Aboyne) and other families; Brogyntyn heirlooms; Lady Harlech 's work in voluntary public service, 1929-1949; and the success of David Ormsby-Gore at Oswestry in the Shropshire election, 1950.