" Cynthia Elinor Beatrix Spencer, Countess Spencer, DCVO, OBE (16 August 1897 – 4 December 1972), known as Lady Cynthia Hamilton until her marriage, and from then as Viscountess Althorp until 1922 when her husband inherited his father's title of Earl Spencer, was a British peeress and the paternal grandmother of Diana, Princess of Wales."

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Links:

http://en.wikipedia.org/wiki/Cynthia_Spencer,_Countess_Spencer

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=13868095

http://www.geneall.net/U/per_page.php?id=13776

http://www.thepeerage.com/p10102.htm#i101014