Helfthryth (of Damerham) 
F, #1233237, d. after 975
Citations
- [S7] Roderick W. Stuart, Royalty for Commoners, Fourth Edition, The Complete Known Lineage of John of Gaunt, Son of Edward III, King of England, and Queen Philippa (Baltimore, MD: Genealogical Publishing Co. Inc, 2002). Repository: Richard Smith Damon Arlington, Middlesex County, Massachusetts, in. Hereinafter cited as Royalty for Commoners, 4th Edition.
- [S31] Roderick W. Stuart, Royalty for Commoners, Third Edition (Baltimore, MD: Genealogical Publishing Co., Inc., 1998). Repository: Winchester Library Winchester, Middlesex County, Massachusetts, in. Hereinafter cited as RFC **** Check RFC4 ****.