- NLW MS 24029A.
A manuscript of the second half of the fourteenth century containing a Llyfr Blegywryd version of the Laws of Hywel Dda, with main text close to that of BL, Cotton, Titus D ix (siglum L). The manuscript was written by four scribes: scribe A (ff. 1-93), scribe B (f. 93), and the more cursive hand of scribe C (ff. 93 verso, 100-101 verso). Scribe D, of the early 15 cent. (f. 97), was responsible for the extraneous section of quire 12 (ff. 94-99), possibly part of another manuscript. This section includes the prayer Emyn Curig (ff. 98-99 verso).
The main text of folios 1-93 (to ln. 6 of f. 93) was transcribed line-for-line for Moses Williams, 'o lyfr William Philips o Aberhodni', in NLW, Llanstephan MS 75, when all but two leaves were present in the manuscript (ff. 7 & 17 being already lost).
A transcript of the present manuscript is available on the Welsh Prose (Rhyddiaith Gymraeg) 1350–1425 project website, and is available online at http://www.rhyddiaithganoloesol.cardiff.ac.uk/en/ms-home.php?ms=Bost5 (viewed December 2012)