Nielsen Hayden genealogy
Llywelyn ap Seisyll, King of Deheubarth
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Name Llywelyn ap Seisyll Suffix King of Deheubarth Born Abt 980 [1] Gender Male Died 1023 [1, 2, 3, 4] Person ID I1804 Ancestry of PNH, TNH, and others | Ancestor of AP, Ancestor of DDB, Ancestor of DGH, Ancestor of DK, Ancestor of EK, Ancestor of GFS, Ancestor of JMF, Ancestor of JTS, Ancestor of LDN, Ancestor of TNH, Ancestor of TSW, Ancestor of TWK, Ancestor of WPF Last Modified 10 May 2019
Father Seisyll Mother Prawst Family ID F5959 Group Sheet | Family Chart
Family Angharad ferch Maredudd Married 994 [2] Children + 1. Gruffydd ap Llywelyn, King of Wales, d. 5 Aug 1064, Ireland 
Last Modified 11 Jan 2016 Family ID F3363 Group Sheet | Family Chart
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Sources - [S49] Genealogics, by Leo Van de Pas.
- [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.
- [S3215] Medieval Welsh Ancestors of Certain Americans by Carl Boyer III. Santa Clarita, California, 2004.
- [S903] The Dictionary of Welsh Biography. National Library of Wales, 2007 and ongoing.
- [S49] Genealogics, by Leo Van de Pas.