Also known as Gruffudd Farwn Gwyn.
On 12 February 1283, the king granted Gruffudd the land of Glyn Dyfrdwy, to hold as a tenant at will (Lloyd, p. 10).
Events
Date of Birth: about 1230.
Place of Birth: unknown.
The date is given by Bartrum (Bleddyn ap Cynfyn 4).
Date of Death: 1289.
Place of Death: unknown.
The date is given by Carr and by Lloyd (p. 11).
Relationships
Father: Gruffudd Maelor ap Madog ap Gruffudd Maelor.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 4), and given by Lloyd (p. 9), by Davies (p. 130), by Stephenson, and by Carr.
Mother: Emma, daughter of Henry de Aldithley.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 4) and given by Stephenson.
(possible) Spouse: Margred ferch Griffri.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 4). The sources for this marriage seem to be rather late.
Children:
Madog married (1) Margred ferch Rhys Ieuanc; married (2) Gwenllian ferch Ithel Fychan.
Evidence
Pryce gives documents made by Gruffudd:
No. 529: a grant to the church of St Asaph made by "Griffin(us) Vychan filius Griffin' ab Mad' dominus de Yal", made in good health and dated 9 February 1278 "on the land itself".
No. 530: a letter to Edward I complaining of harassment from Margaret widow of Madog Fychan, lady of Bromfield.
No. 531: a 1283 grant to John de Warenne, earl of Surrey and Sussex made by "Griffinus Vaughan filius Griffini de Bromfeud'".
No. 532: a letter patent concerning Edward I, made by "Griffinus Vaghan filius Griffini filii Madoci", dated 4 March 1283 at Llanegwestl [Valle Crucis] Abbey.
References
Bartrum, Peter C., “Bleddyn ap Cynfyn 4” in An Electronic Version of Welsh Genealogies AD 300-1500.
[The sources Bartrum cites for Gruffudd are: Rhandiroedd Powys (5), a MS written by 1493; Peniarth 131 (179), written by Gutun Owain about 1480; Peniarth 129 (57, 59), copied about 1500 from a 1497 MS by Gutun Owain; Peniarth 127 (24), written by Syr Thomas ap Ieuan ap Deicws between about 1510 and 1523; and the Welsh Assize Roll, 1277-1284 (246).]
Bartrum, Peter C. “Rhandiroedd Powys” in National Library of Wales journal, Volume 18, pp. 231-237 (1973). [Bartrum notes that it contains definite errors, but seems to have been regarded as authoritative by genealogists of the sixteenth century.]
Carr, A.D. “Madog ap Gruffudd Maelor (d. 1236)” in the Oxford Dictionary of National Biography (Oxford University Press, 2004).
Davies, R.R. The Revolt of Owain Glyn Dŵr. (Oxford U.P., 1995).
Lloyd, J.E. Owen Glendower (Oxford at the Clarendon Press, 1931).
Pryce, Huw (ed.) The Acts of the Welsh Rulers 1120 - 1283 (Malta, 2005).
Stephenson, David. Medieval Powys: Kingdom, Principality and Lordships, 1132-1293. (The Boydell Press, 2016).