An imperfect early seventeenth century manuscript containing one of the five known sixteenth or seventeenth century copies of the Welsh prose text entitled 'Y Marchog Crwydrad' or 'Treigl y Marchog Crwydrad', the other four being found in Llanstephan MS 178, NLW MS 15533B (previously Llanwrin MS 2), Cwrt Mawr MS 30 (fragment), and NLW MS 15541A (previously in Belmont Abbey, co. Hereford), all in the National Library of Wales. Apart from the exceptions noted in the foliation description the present text is in one hand which, it has been suggested, is the same hand as that of the unidentified scribe of the text to be found in NLW MS. 15533B. The present text is incomplete wanting the following - Section I, the whole of chapter 1, the beginning of chapter 2, the end of chapter 4, and the greater part of chapter 5, Section III, part of chapter 2, part of chapter 3, the end of chapter 7, the whole of chapter 8, the beginning of chapter 9, the greater part of chapter 10, and the whole of chapters 11 and 12, and, as already indicated under description of foliation above, in two instances lacunae in the text have been filled in a different hand. The version of the Welsh text which appears in NLW MS 15533B was published by D. Silvan Evans in Y Brython, cyf. V, 1862-3, tt. 1- 17, 138-53, 257-67, 361-74, and subsequently republished as a separate pamphlet or booklet with the title Y Marchog Crwydrad. Hen Ffuglith Gymreig in 1864.