"In one of their rambles, at a place near Dol Howel, at the Mountain Gate, still called 'Llidiad y Meddygon,' (The Physician's Gate), the mother appeared suddenly, and accosted her eldest son, whose name was Rhiwallon, and told him that his mission on earth was to be a benefactor to mankind by relieving them from pain and misery, through healing all manner of their diseases; for which purpose she furnished him with a bag full of medical prescriptions and instructions for the preservation of health. That by strict attention thereto he and his family would become for many generations the most skilful physicians in the country. Then, promising to meet him when her counsel was most needed, she vanished. But on several occasions she met her sons near the banks of the lake, and once she even accompanied them on their return home as far as a place still called 'Pant-y-Meddygon,' (The dingle of the Physicians) where she pointed out to them the various plants and herbs which grew in the dingle, and revealed to them their medicinal qualities or virtues; and the knowledge she imparted to them, together with their unrivalled skill, soon caused them to attain such celebrity that none ever possessed before them. And in order that their knowledge should not be lost, they wisely committed the same to writing for the benefit of mankind throughout all ages. And so ends the story of the Physicians of Myddfai, which had been handed down from one generation to another, thus:-- "Yr hen wr llwyd o'r cornel, Gan ei dad a glywodd chwedel, A chan ei dad fy glywodd yntau, Ac ar ei ol mi gofiais innau." "The grey old man in the corner Of his father heard a story, Which from his father he had heard, And after them I have remembered." The Physicians of Myddfai were Rhiwallon and his sons, Cadwgan, Gruffydd and Einion, who became Physicians to Rhys Gryg, Lord of Llandovery and Dynefor Castles, who lived in the early part of the thirteenth century. Rhys "gave them rank, lands, and privileges at Myddfai for their maintenance in the practice of their art and science, and the healing and benefit of those who should seek their help." The fame of the celebrated Physicians was soon established over the whole country, and continued for centuries among their descendants; and the celebrated Welsh Poet Dafydd ap Gwilym, who flourished in the fourteenth century, says in one of his poems when alluding to these physicians:-- "Meddyg, nis gwnai modd y gwnaeth Myddfai, o chai ddyn meddfaeth." (A Physician he would not make As Myddfai made, if he had a mead fostered man.)