Williams, John, ab Ithel, 1811-1862.

The physicians of Myddvai : Meddygon Myddvai, or, The medical practice of the celebrated Rhiwallon and his sons, of Myddvai, in Caermarthenshire, physicians to Rhys Gryg, lord of Dynevor and Ystrad Towy, about the middle of the thirteenth century / from ancient mss. in the libraries of Jesus College, Oxford, Llanover, and Tonn ; with an English translation ; and the legend of the lady of Llyn y Van ; translated by John Pughe and edited by John Williams ab Ithel. Published for the Welsh Mss. Society.