A composite manuscript. Mainly an informal collection of pedigrees, narrative and tabular, of both north and south Wales, in the hands of Gruffudd Hiraethog (pp. 1-7, 9-16, 18-22, 71-87, 153-260, etc.) and Wiliam Llŷn (e.g. pp. 26-48, 61-70, 91-152). Gruffudd was writing between 1562 (pp. 2, 20, 418) and 1564 (pp. 22, 201). On the manuscripts cited by him, see P.C. Bartrum, ‘Genealogical sources quoted by Gruffudd Hiraethog’, National Library of Wales Journal, 26 (1989-90), 1-9. Wiliam Llŷn left a few dates, e.g. 1564 (p. 95) and 1567 (p. 32). Gruffudd records many coats of arms in houses, churches, etc. (pp. 9-16, 153-260, 299-301). On pp. 531-6 he copied ‘Geirie gan Taliessin ai gyngor ai gyssul’ from ‘llyfr Ieuan ap Jhon ap Mred or Glyn’, together with triads [pp. 129-30 of Peniarth MS 137 apparently belong here]. On pp. 427-82, in the hand of Wiliam Llŷn, is an armorial in Welsh, the arms in trick, referred to on p. 479 as ‘Llyfr arfau o waith Wiliam Llyn’ [see M.P. Siddons, The Development of Welsh Heraldry, 4 vols (Aberystwyth, 1991-2006), I, pp. 44–6]. Other contemporary hands contributed: A, Huws’ X131 (pp. 49-56); B (pp. 59-60); C, Huws’ X180 (pp. 294-5); D, Huw Llŷn, south Wales pedigrees (pp. 333-62); E (pp. 363-77); F, Welsh arms (pp. 397-408); G (pp. 423-6); H, a copy of extents, in Welsh, of lands of the earl of Arundel, 26 Edward III (pp. 483-503); I, Huws’ X129, pedigrees of Maelor Gymraeg (pp. 507-30). On pp. 391-2 is a copy by Gruffudd Hiraethog of a letter from Thomas Read of Green Castle, Carm.