Iorworth Drwyndwn Prince Of Gwynedd 
Iorworth Drwyndwn's father was Owain Gwynedd Prince Of Gwynedd and his mother was Gladys. His paternal grandparents were Gruffydd Ap Cynan, Prince Of Gwynedd and Angharat of Tegaingl; his maternal grandparents were Llywarch ap Trahaearn and Dyddgu. He had a half-brother named Iorwerth. He died in 1174.1 General Notes
[MARSHALL.FTW]
SOURCE NOTES:
Baldwin, Stewart, Llywelyn ap Iorwerth ancestor table, posting to GEN-MEDIEVAL
7/27/97, sbald@@auburn.campus.mci.net.
Moncreiffe, Sir Ian of that Ilk, Royal Highness: Ancestors of the Royal Child.
London: Hamish Hamilton, 1982. NYPL ARF 83-3293.
Tapsell, R. F., Monarchs, Rulers, Dynasties and Kingdoms of the World. New
York: Facts on File Publications, 1983.
Weis, Frederick Lewis, Ancestral Roots of Sixty Colonists, 6th Edition,
Baltimore: Genealogical Publishing Co, 1988.
RESEARCH NOTES:
1170-1174: Prince of Gwynedd [Ref: Tapsell p178] Prince of North Wales [Ref:
Weis AR #176] Prince of Nanconwy [Ref: Moncreiffe p10]
hald castle of Dolwyddelan [Ref: Moncreiffe p10]
styled 'ruler of Arfon' [Ref: Moncreiffe p10]
SOURCE NOTES:
parents: [Ref: Stewart Baldwin 7/27/97, Weis AR #176], father: [Ref:
Moncreiffe p10, Tapsell p178]
SOURCE NOTES:
date: [Ref: Tapsell p178]
Details of Iorworth Drwyndwn's family with Margred Ferch Madog
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