Rhiwallon Of Myddfai: 1 book

"The Physicians of Myddfai"("Meddygon Myddvai" in Welsh), or "The medical practice of the celebrated Rhiwallon and his sons, of Myddfai, in Carmarthenshire, physicians to Rhys Gryg, lord of Dynevor and Ystrad Towy", was written about the middle of the 13th century....