A transcript, 1819, made by Peter Bayley Williams of Cyfrinach Beirdd Ynys Prydain ... edited by Edward Williams ('Iolo Morganwg').

Extracts, in the hand of Walter Davies, from Cyfrinach Beirdd Ynys Prydain, possibly made from the original draft written by Edward Williams (Iolo Morganwg); and notes by Walter Davies entitled 'Sylwadau ar ba Gyhydeddau a Mesurau y canent y prif-feirdd', and based on a study of the earlier Welsh poetry printed in the first volume of The Myvyrian Archaiology of Wales.