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Rh G.T.: Gwilym Tew (Glam.), c. 1450.

Gu.O., Gut.O.: Gutun Owain (Denb.), fl. 1450–90.

G.V.: Gruffudd Vychan, c. 1320.

G.Y.C.: Gruffudd ab yr Ynad Coch, c. 1280.

H.A.: Huw Arwystl c. 1550.

H.C.Ỻ.: Huw (or Hywel) Cae Llwyd, c. 1480 [Ỻ p. 428 footn. for 1525 read 1475].

H.D.: Huw Dafi, or Hywel ap Dafydd ab Ieuan ap Rhys (Brec.), c. 1480.

H.K.: Hywel Kilan (l ≡ l-l) (Llŷn?), c. 1480.

H.M.: Hugh Maurice (Denb.), 1622–1709; ref. to Eos Ceiriog&#8203;…&#8203;2 vols. Wrexham, 1823.

H.O.G.: Hywel ab Owain Gwynedd, Prince of the House of Gwynedd, d. 1170.

H.R.: Hywel Rheinallt, c. 1480.

H.S.: Hywel Swrdwal (Montgomerysh.), c. 1450; ref. to Gwaith Barddonol Hywel Swrdwal a’i Fab Ieuan, ed. by J. C. Morrice, Bangor Welsh MSS. Soc., 1908.

I.B.H.: Ieuan Brydydd Hir (Merioneth), c. 1450.

I.C.: Iorwerth ab y Cyriawg, c. 1360.

I.D.: Ieuan Deulwyn (Carm.), fl. 1460–80; ref. to Gwaith Ieuan Deulwyn, ed. by Ifor Williams, Bangor Welsh MSS. Soc. 1909.

I.F.: Iorwerth Fynglwyd (Glam.), c. 1490.

I.G.: Iolo Goch (Denb.), fl. 1370–1405; ref. to Gweithiau Iolo Goch&#8203;…&#8203;Gan Charles Ashton, Cymmro&shy;dorion Soc., 1896.

I.H.S.: Ieuan ap Hywel Swrdwal, c. 1470; ref. as for H.S., q.v.

I.Ỻaf.: Ieuan Llavar, c. 1590.

Io.G. = I.G.

I.R.: Ieuan ap Rhydderch ab Ieuan Llwyd, c. 1420.

I.T.: Ieuan Tew o Gydweli, c. 1460 (often confused with the later, and lesser, Ieuan Tew who graduated at the Caerwys Eistedd&shy;fod of 1568).

L.G.C.: Lewis Glyn Cothi, fl. 1440–80; ref. to Gwaith Lewis Glyn Cothi&#8203;…&#8203;Oxford 1837.

L.M.: Lewis Morris (Llywelyn Ddu o Fôn), 1701–65.

L.Môn: Lewis Môn, c. 1500.

L.Mor.: Lewis Morgannwg, c. 1520.

Ỻ.: Llawdden (Llandeilo, 320), c. 1460.

Ỻ.G.: Llywelyn Goch Amheurig Hên, c. 1380.

M.: Meilyr (Anglesey), c. 1137.

M.B.: Madog Benfras, c. 1380.

M.D.: Madog Dwygraig, c. 1370.

M.K.: Maurice Kyffin; ref. to Deffynniad Ffydd Eglwys Loegr 1595, reprint ed. by Wm. Pochard Williams, Bangor 1908.

M.Ỻ.: Morgan Llwyd o Wynedd, 1619–1659; ref. to Gweithiau Morgan Llwyd o Wynedd, i ed. by Thomas E. Ellis, Bangor 1899; ii ed. by John H. Davies, Bangor 1908.

M.R.: Maredudd ap Rhys, c. 1440.