Cynthia Ellinor Beatrix Spencer, Countess Spencer (née Hamilton; 16 August 1897 â 4 December 1972) was a British peeress and the paternal grandmother of Diana, Princess of Wales.
Cynthia Hamilton was the daughter of James Hamilton, Marquess of Hamilton, later 3rd Duke of Abercorn (30 November 1869 â 12 September 1953) and Lady Rosalind Cecilia Caroline Bingham (26 February 1869 â 18 January 1958).
Hamilton married Viscount Althorp on 26 February 1919 at St James's Church, Piccadilly, London.
They had two children:
Lady Spencer was appointed a lady of the bedchamber to Queen Elizabeth in 1937. She continued in the role after Elizabeth became queen mother in 1952, and remained in post until her death.
She was the grandmother of Diana, Princess of Wales. Lady Spencer died at the Spencers' ancestral home, Althorp, of a brain tumour on 4 December 1972, aged 75. The Cynthia Spencer Hospice in Northampton is named in her memory.
Lady Spencer was little known outside court and local circles until, twenty years after her death, Andrew Morton wrote that the Princess of Wales "believes that her grandmother looks after her in the spirit world."