Nielsen Hayden genealogy
Family: Llywelyn Fawr ap Iorwerth / Joan of England (F2856)
m. Bef 23 Mar 1205-
Father | Male
Llywelyn Fawr ap Iorwerth
Born Abt 1173 Died 11 Apr 1240 Aberconwy Abbey, Conwy, Wales 
Buried Aberconwy Abbey, Conwy, Wales 
Married Bef 23 Mar 1205 [1, 2, 3] Other Spouse (One of the several mistresses of Llywelyn ap Iorwerth) | F1936 Married Other Spouse Tangwystl | F2104 Married Other Spouse Eve Fitzwarine | F8310 Married 1239 Father Iorwerth Drwyndwn ap Owain Gwynedd | F993 Group Sheet Mother Margred ferch Madog | F993 Group Sheet
Mother | Female
Joan of England
Born Bef 1190 Died 30 Mar 1236 Buried Llanvaes, Anglesey, Wales 
Father John, King of England | F135 Group Sheet Mother Clemence | F135 Group Sheet
Child 1 | Female
+ Gwladus Ddu
Born Died 1251 Windsor, Berkshire, England 
Buried Spouse Reynold de Briouze | F1970 Married 1215 Spouse Ralph de Mortimer | F3387 Married Bef 26 Oct 1230
Child 2 | Female
+ Ellen of Wales
Born Died Bef 24 Oct 1253 Buried Spouse Robert de Quincy | F12064 Married Bef 5 Dec 1237
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Sources - [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008., says "1206".
- [S839] William Addams Reitwiesner, "The Children of Joan, Princess of North Wales." The Genealogist 1:80, Spring 1980., "before 15 Oct 1204".
- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.