O.G.: Owain Gwynedd, c. 1580.
P.M.: Llywarch ap Llywelyn, Prydydd y Moch (Wigwer, St. Asaph; “wele [gwely] Pridith Mogh” at “Wyckewere”, Seebohm 31), c. 1160–1220.
R.C.: Rhys Cain, c. 1580.
R.D.: Richard Davies (Conway), Bp. of St. Davids, 1501–81; translator of some epistles in Wm.S.’s N.T. 1567.
R.G.D.: Robert ap Gwilym Ddu = Robert Williams, Betws Fawr, Llanystumdwy, 1767–1850; ref. to Gardd Eifion…Dolgellau 1841.
R.G.E.: Rhys Goch Eryri (C’vonsh.), c. 1430.
R.G.G.: Rhys Goch Glyndyfrdwy, c. 1420 (?), see G.C.
R.Ỻ.: Rhys Llwyd ap Rhys ap Rhicart, c. 1460.
R.M.: Richard Morris (Anglesey, brother of L.M.), 1703–79; editor of Bible, 1746, 1752.
R.V.: Rowland Vaughan, Gaer Gai, Llanuwchllyn, d. 1667.
Salesbury, see Wm.S.
S.B.: Siôn Brwynog (o Frwynog ym Môn), d. 1562.
S.C.: Siôn Cent (Kentchurch), c. 1420.
S.M.: Siôn Mawddwy (native of Glam.), c. 1580.
S.Ph.: Siôn Phylip (Ardudwy, Mer.), 1543–1620.
S.T.: Siôn Tudur (Wigwer, St. Asaph), d. 1602.
S.V.: Simwnt Vychan (Ruthin), born c. 1530, d. 1606; author of P.Ỻ.
T.: Talhaiarn = John Jones, Llanfair Talhaearn, 1810–69; ref. to Gwaith Talhaiarn, i London 1855, ii London 1862, (iii Llanrwst 1869).
T.A.: Tudur Aled (N. Denb.), fl. 1480–1520.
W.Ỻ.: Wiliam Llŷn (? Llŷn ; res. Oswestry), 1535–80; ref. to Barddoniaeth Wiliam Llŷn…Gan y Parch. J. C. Morrice M.A. Bangor 1908.
W.M.: William Morris (brother of L.M.), 1705–63.
Wm.S.: Wyllyam Salesbury (Llanrwst); translator of the bulk of N.T. 1567; joint tr. and ed. of Pb. 1567, 1586; etc.
Wms.: William Williams, Pant y Celyn (Carm.); hymn-writer, 1717–91; ref. to Gwaith Prydyddawl…William Williams…sef yr Holl Hymnau…Caerfyrddin, 1811, definitive edn. by his son.
