A transcript by John Thomas ('Sion Wyn o Eifion') of cywyddau and other poems by Robin Ddu, Rhys Goch Eryri, Iolo Goch, Tudur Aled, Dafydd Gorlech, Dafydd Llwyd ap Llywelyn ap Gruffudd, Dafydd ap Hwlcyn ap Madog, Rhys Llwyd ap Rhys, Maredudd ap Rhys, Mathew Owen, Edward Morus and Sion Lleyn; the manuscript also contains triads, genealogies, 'Breiniau Gwŷr Arfon', 'Meddygon Myddfai', 'geirlyfr William Lleyn', etc.

Pedigrees, mainly of North Wales families; a list of uncommon Welsh words taken from John Davies, Mallwyd: Dictionarium ... (London, 1632); a vocabulary of some 'hard' Latin words; 'cywyddau' and other poems by Rowland Williams, Rhys Meigen, Dafydd ap Gwilym, Rowland Vaughan, Siôn Cent, Dafydd ab Edmwnd, Wiliam Phylip, Owen Gruffydd, Edmwnd Prys, Robin Ddu, Siôn Phylip, Sion Tudur, Gruffudd Phylip, Maredudd ap Rhys, Gutun Owain, Iolo Goch, Morus Berwyn, Ffowc Prys, Owain Gwynedd, Roger [C]yffin, Siôn Brwynog, Syr Owain ap Gwilym, Wiliam Llŷn, Huw Arwystli, Richard Phylip, Dafydd Nanmor, [If]an Llwyd ('o wain Eingian'), Hywel Cilan, Edwart Urien, Lewis Glyn Cothi, Rhys Cain, Lewis Trefnant, Matthew Brwmffild, James Dwnn, Ieuan Dew Brydydd, Heilyn Fardd, Huw Machno, Guto'r Glyn, etc. ; a description of Britain based on the early chronicles; the triads of Dyfnwal Moelmud; etc.