A volume of cywyddau, awdlau and a few englynion, including sections devoted to the works of Guto'r Glyn, Tudur Aled and Sion Cent. The contents of this MS are listed in Mostyn 112, pp. 631-654; there the MS is described as 'llyfyr kowydde sydd a chayad gantho o barsmant gwyn'. The works of Guto'r Glyn and Tudur Aled appear in roughly the same order as in (Bangor) Gwyneddon MS 4, which suggests that those sections were drawn from a similar source. The works of Guto'r Glyn, ff. 78 verso-109, 122-141, 195 recto-verso, and 199-201, have apparently been transcribed by the compiler of Mostyn 1 [NLW MS 3021F], pp. 559-606 and the works of Tudur Aled, ff. 153 verso-156 verso, 44-45 verso, 156 verso-177, 147-151, and 151 verso-153 verso, have been transcribed in the same way to Mostyn 1, pp. 799-826.
The MS is in five main hands: ff. 6-38 verso, 41-69, and ?221-223 verso, a hand also found in Mostyn MS 161 [NLW MS 3057D], pp. 670-674, 677-683, and possibly that of the poet Richard Cynwal (ob. 1634) [this hand is not dissimilar to that of Wmffre Dafis]; ff. 38 verso-40 verso and 226-231 verso, also found in Mostyn 161, pp. 529-654; ff. 69 verso-78, 90-114, 203 verso-204 verso, ?220 verso-221 verso, 231 verso-238, and 239 verso-243 verso; ff. 1-5, 78 verso-90, 114-203, and 245 verso-253 verso; it is the same hand as Mostyn 161, pp. 987-994 and Mostyn 112, part II, [NLW MS 3031B], pp. 632-654. This hand adds many marginal notes; and ff. 205-220, 224-225, 238 verso-239, 243 verso-245 verso, and 253 verso-257, with f. 258 probably in the autograph of the poet Sion Dafydd Las [John Davies, dec. 1694].