Events
Date of Birth: unknown.
Place of Birth: unknown.
Bartrum gives Gwenllian a number of 4 in his generational dating system, which implies a birth date of, very roughly, about 1130.
Date of Death: unknown.
Place of Death: unknown.
Relationships
Father: Owain Gwynedd ap Gruffudd ap Cynan.
This relationship is shown by Bartrum (Gruffudd ap Cynan 3).
Mother: Gwladus ferch Llywarch.
This relationship is shown by Bartrum (Gruffudd ap Cynan 3).
Spouse: Owain Cyfeiliog ap Gruffudd ap Maredudd.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 29).
Children:
(Complete source citations for facts about the children on this page are currently outside of the scope of this project. Most information below comes from Bartrum.)
Gwenwynwyn (died 1216) married Margred ferch yr Arglwydd Rhys; also married Margred, daughter of Robert Corbet of Cause.
Meddefus married Gronwy ab Einion.
References
Bartrum, Peter C., “Gruffudd ap Cynan 3” in An Electronic Version of Welsh Genealogies AD 300-1500.
[The source that Bartrum cites for Gwenllian is his own Early Welsh Genealogical Tracts.]
Bartrum, Peter C (ed.) Early Welsh Genealogical Tracts. (Cardiff: University of Wales Press, 1968).
The sources Bartrum gives for Owain are:
Achau Brenhinoedd a Thywysogion Cymru (probably based on 15th century MSS):
2a. [Plant Ywein Gwynedd]: “Iorwerth a Maelgwn a Gwenlliant, mam Wenwynwyn ap Owain Kyveiliawg, plant Owain Gwynedd.”
8g. “Gwenwynwyn ap Ywain Kyveilioc ap Gruffudd ap Meredudd ap Bleddyn ap Kynvyn ap Gwerystan ap Gweithfoet ap Gwny ap Gwlydden ap Gwrydyr ap Karadawg… I vam oedd Wenllian verch Ywain Gwynedd ap Gruffudd ap Kynan ap Iago...”
Guy, Ben. Medieval Welsh Genealogy. (The Boydell Press, 2020).
From Guy’s critical edition of the Llywelyn ab Iorwerth genealogies, which were based on an archetype created no later than the first half of the fourteenth century from an original compilation dating to the early thirteenth century, partly based on earlier written sources (Note that Guy is striving for textual rather than genealogical accuracy):
12 Plant Ywain Gwyned:
12.1 Iorwerth a Maelgwn a Gwenlliant mam Wenwynwyn ap Ywain Kyfeiliawg, plant Ywain Gwyned, a Gwladus oed eu man, ferch Llewarch ap Trehayarn ap Karadawg ap Gwynn ap Gollwyn ap Ednywain ap Bledynt ap Bledrus ap Kynawg Mawr ap Iorwerth Hirvlawt ap Tegonwy ap Teon