This collection consists of files and notebooks of handwritten research material on various topics of Welsh history including: Wales during the Civil War period; the Glyndwr Rebellion; the dioceses of Bangor, St Asaph and St David; Monasticism in Wales; Education in Wales; Roman Catholics in Wales; the Lordship of Chepstow, and the later Stuart monarchs, William, Mary and Anne. There is also material relating to pedigrees of families in Monmouthshire, Carmarthenshire, Brecknockshire, Cardiganshire and Glamorgan.
Also includes a file of letters from J.R. Gabriel to Sir Frederick Rees, dated 1912-1961, many of them relating to the Civil War.