Nielsen Hayden genealogy
The Victoria County History of Hertfordshire. Portions online, linked from medievalgenealogy.org.uk.
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Title The Victoria County History of Hertfordshire. Portions online, linked from medievalgenealogy.org.uk. Source ID S1148 Linked to (4) Ela de Herdeburgh
Hugh de Herdeburgh
Roger de Herdeburgh
John Leventhorpe