Sources
🟢 Primary Evidence
🟡 Secondary Evidence
🟠 Tertiary Evidence
🔴 Unreliable Evidence
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- [S1943] Anderson, Kim & Richard Joscelyne. "The Parentage of Geoffrey fitz Eustace (c.1045-1105)", (Vowchurch, UK: Foundations: Journal of the Foundation for Medieval Genealogy, Volume 10, 2018).
- [S1940] Panton, Kenneth J. Historical Dictionary of the British Monarchy, (Lanham, UK: Scarecrow Press, 2011).
- [S1715] Searle, William George. Anglo-Saxon Bishops, Kings and Nobles, (Cambridge, UK: Cambridge University Press, 1899).
- [S65] Sewell, Robert James. Sewell: A History of the Sewell Family from the Earliest Times, (unknown: manuscript, March 2008).
- [S60] Stuart, Roderick W., Royalty for Commoners, The Complete Known Lineage of John of Gaunt, Son of Edward III, King of England, and Queen Philippa Fourth Edition, (Baltimore, Maryland: Genealogical Publishing Company, 2002).
- [S1682] Weir, Alison. Britain's Royal Families, (London: Vintage Books, 1989).
- [S59] Weis, Frederick Lewis. Ancestral Roots of Sixty Colonists Who Came to New England Between 1623 and 1650 Fifth Editionif, (Baltimore, Maryland: Genealogical Publishing Co., 1982).
- [S304] Wikipedia, Godgifu, daughter of Æthelred the Unready.
- [S304] Wikipedia, Eustace II, Count of Boulogne.
- [S304] Wikipedia, Drogo of Mantes.
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