Events
Date of Birth: unknown.
Place of Birth: unknown.
Bartrum (Carwed 2) gives Jonet a number of 12 in his generational dating system, implying a birth date of, very roughly, about 1400.
Date of Death: after 1480.
Place of Death: unknown.
Carr (1975, p. 135) notes that Jonet survived her husband.
Relationships
Father: Dafydd ab Ieuan ap Hywel.
This relationship is shown by Bartrum (Carwed 2). It is given by Carr (1975, p. 134).
Mother: Angharad ferch Gwilym ap Gruffudd.
This relationship is shown by Bartrum (Carwed 2).
Spouse: Gruffudd ap Rhys ap Gruffudd.
This relationship is shown by Bartrum (Carwed 2; Mabon Glochydd 2). It is given by Carr (2017, p. 152). The elegy by Robin Ddu ap Siencin and Dafydd Llwyd of Nantconwy (Mostyn pp. 62-3) mentions Sioned.
Children:
Dafydd (died 1448).
Gwilym (died 1448).
Rhys (died 1448).
Llywelyn (died 1448).
Sion (died 1448).
Catrin (died 1448).
Annes (died 1448).
Margred (died 1532) married (1) Hywel “the Dun Stag” ab Ieuan Fychan ab Ieuan; married (2) Harry Salesbury.
References
Bartrum, Peter C., “Carwed 2” in An Electronic Version of Welsh Genealogies AD 300-1500.
[The sources that Bartrum cites for Jonet are: Peniarth 129 (63, 102), copied about 1500 from a 1497 MS by Gutun Owain; Peniarth 127 (118), written by Syr Thomas ap Ieuan ap Deicws between about 1510 and 1523; and Peniarth 128 (253a, 599a), “Llyfr Edward ap Roger”, written before 1582.]
Carr, Antony David. The Mostyn Family and Estate, 1200-1643 (PhD thesis, University of Wales, 1975).
Carr, A.D. The Gentry of North Wales in the Later Middle Ages. (University of Wales Press, 2017).
Mostyn, the Right Hon. Lord, and T. A. Glenn. History of the Family of Mostyn of Mostyn (London: Harrison and Sons, Ltd., 1925).