Nielsen Hayden genealogy
Family: Walter de Burgh / Avelina fitz John (F5511)
m. Abt 1257
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Male
Walter de Burgh
Birth Abt 1229 Death 28 Jul 1271 Galway Castle, Galway, Ireland 
Burial Athassel-on-the-Suir, Tipperary, Ireland Marriage Abt 1257 [1, 2, 3, 4, 5] Father Richard de Burgh | F4332 Group Sheet Mother Gille de Lacy | F4332 Group Sheet
Female
Avelina fitz John
Birth Death Abt 20 May 1274 Burial Dunmow Priory, Little Dunmow, Essex, England Father John fitz Geoffrey | F3969 Group Sheet Mother Isabel le Bigod | F3969 Group Sheet
Male
+ Richard de Burgh
Birth Abt 1259 Death 29 Jul 1326 Monastery at Athassel-on-the-Suir, Tipperary, Ireland Burial Spouse Margaret | F11253 Marriage Bef 27 Feb 1281
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Sources - [S53] The Magna Charta Sureties, 1215: The Barons Named in the Magna Charta, 1215, and Some of Their Descendants Who Settled in America During the Early Colonial Years by Frederick Lewis Weis. Fifth edition, with additions and corrections by Walter Lee Sheppard, Jr. and William R. Beal. Baltimore: Genealogical Publishing Company, 1999.
- [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.
- [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.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001.
- [S53] The Magna Charta Sureties, 1215: The Barons Named in the Magna Charta, 1215, and Some of Their Descendants Who Settled in America During the Early Colonial Years by Frederick Lewis Weis. Fifth edition, with additions and corrections by Walter Lee Sheppard, Jr. and William R. Beal. Baltimore: Genealogical Publishing Company, 1999.