File NLW MS 8497B - Gwaith Thomas Wiliems,

A collection of 'cywyddau' and 'englynion' mainly in the early hand of Thomas Wiliems, otherwise called Thomas ap William, of Trefriw, with a few items in his later hand. The poets represented are Iorwerth Beli, G[o]ronwy Gyriog, Owen ap Llywelyn [ap] Moel [y Pantri], Dafydd ab Edmwnd, Lewis Môn, Tudur Aled, Lewis Daron, Guto'r Glyn, Iolo Goch, Inco Brydydd, Thomas Prys, Ieuan Brydydd Hir [Hynaf], Llawdden, Ieuan Deulwyn, Rhys Nanmor, Rhys Pennardd, Robin Ddu ap Siencyn Bledrydd, Ieuan ap Tudur Penllyn, Ithel ap Rhys, Gwilym ab Ieuan Hen, Tudur Penllyn, Dafydd Llwyd ap Llywelyn ap Gruffudd, Llywelyn ab y Gutun, Lewis Glyn Cothi, Mastr Harri, Ieuan [D]ew Brydydd, Rhys Goch Glyndyfrdwy, Ieuan ap Hywel Swrdwal, Gruffudd Gryg and Gutun Owain. There is a section at the end of the book in another hand of the close of the sixteenth century. Simwnt Vychan wrote one of the poems in this section. There are marginal notes, mainly genealogical, by John Davies, Rhiwlas, Llansilin throughout the entire manuscript.