Nielsen Hayden genealogy
Bertha
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Name Bertha [1, 2] Gender Female Person ID I5758 Ancestry of PNH, TNH, and others Last Modified 6 Jan 2018
Family Henry de Ferrers, b. of Ferrieres St. Hilaire, Normandy, France 
d. Aft 1086, of Tutbury, Burton-on-Trent, Staffordshire, England Children + 1. (Unknown brother of Robert de Ferrers d. 1139) + 2. Robert de Ferrers d. 1139 Family ID F1578 Group Sheet | Family Chart Last Modified 28 Nov 2014
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Sources - [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.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001.
- [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.