Gwenllian verch Ednyfed Vychan
- Marriage (1): Llywelyn the Great Prince of Gwynedd
Source: A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain & Ireland" by John Burke & John Bernard Burke, vol. I, London, 1847, p. 737 has "Gwenllian, m. Llewelyn, the great Prince of North Wales."
Gwenllian married Llywelyn the Great Prince of Gwynedd, son of Iorwerth Drwyndwn ap Owain Gwynedd Prince of North Wales and Marared ferch Madog ap Maredudd. (Llywelyn the Great Prince of Gwynedd was born about 1173 in <Dolwyddelan, Conwy>, Wales, died on 11 Apr 1240 in Cistercian Abbey of Aberconwy, Wales and was buried in Llanrwst Parish Church, Wales.)